subject:(Polypropylene)

1. Mouffok, Samir. Etude de la photo-oxydation dans les conditions accélérées et naturelles des mélanges ternaires : Polypropylène /Polyamide-6/PP-g-MA.

Degree: 2015, Université M'Hamed Bougara Boumerdès

URL: http://dlibrary.univ-boumerdes.dz:8080123456789/2097

►

107 p. : ill. ; 30 cm

Ce travail porte sur l'étude de la photo-oxydation dans les conditions accélérées et Naturelles des Mélanges Ternaires Polypropylène… (more)

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107 p. : ill. ; 30 cm

Ce travail porte sur l'étude de la photo-oxydation dans les conditions accélérées et Naturelles des Mélanges Ternaires Polypropylène (PP)/Polyamide-6 (PA-6)/PP-g-MA. La première partie est consacrée à la mise en oeuvre des mélanges PP/PA-6 (70/30 et 30/70 % massique) à différents taux de compatibilisant PP-g-MA " en fondue ". Au travers des différentes techniques utilisées, les résultats révèlent que les mélanges binaires présentent une morphologie dispersée et de faibles propriétés mécaniques. L'incorporation du PP-g-MA améliore la compatibilité des échantillons élaborés et par conséquent, leurs propriétés rhéologiques et mécaniques. Le second volet de la thèse traite de l'étude du photo-vieillissement accéléré simulé au laboratoire sur les mélanges PP/PA-6 (70/30 % massique) à 0 et 2 % massique du PP-g-MA. L'ensemble des résultats de cette étude suggère que la photo-oxydation dans les mélanges PP/PA-6 commence dans la phase PA-6 initiant ainsi l'oxydation des chaines du PP. La photo-oxydation des deux phases se produit simultanément suite aux interactions entre les photo-produits des deux composantes, ce qui conduit à l'accélération de la cinétique de la dégradation des mélanges. Même si la présence du compatibilisant PP-g-MA ne modifie pas le mécanisme de photo-oxydation des mélanges PP/PA-6, il a été montré qu'il accélère leur cinétique de dégradation. Dans la troisième partie consacrée à l'étude de l'effet du vieillissement naturel sur la structure et les propriétés physiques des mélanges de polymères PP/PA-6 /PP-g-MA, les résultats révèlent que le compatibilisant ne modifie pas le mécanisme de dégradation de ces mélanges en concordance avec les résultats du vieillissement accéléré. L'exposition à la lumière UV naturelle pour une durée d'une année diminue la viscosité et les propriétés mécaniques des mélanges PP/PA-6 indépendamment du taux du PP-g-MA. De même que le vieillissement accéléré, le vieillissement naturel augmente le degré de cristallinité et réduit la température de fusion du PP et du PA-6 que ce soit en tant que polymères vierges ou en tant que composantes dans les mélanges.

Subjects/Keywords: Polyamide; Polypropylene

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APA (6^th Edition):

Mouffok, S. (2015). Etude de la photo-oxydation dans les conditions accélérées et naturelles des mélanges ternaires : Polypropylène /Polyamide-6/PP-g-MA. (Thesis). Université M'Hamed Bougara Boumerdès. Retrieved from http://dlibrary.univ-boumerdes.dz:8080123456789/2097

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mouffok, Samir. “Etude de la photo-oxydation dans les conditions accélérées et naturelles des mélanges ternaires : Polypropylène /Polyamide-6/PP-g-MA.” 2015. Thesis, Université M'Hamed Bougara Boumerdès. Accessed February 27, 2021. http://dlibrary.univ-boumerdes.dz:8080123456789/2097.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mouffok, Samir. “Etude de la photo-oxydation dans les conditions accélérées et naturelles des mélanges ternaires : Polypropylène /Polyamide-6/PP-g-MA.” 2015. Web. 27 Feb 2021.

Vancouver:

Mouffok S. Etude de la photo-oxydation dans les conditions accélérées et naturelles des mélanges ternaires : Polypropylène /Polyamide-6/PP-g-MA. [Internet] [Thesis]. Université M'Hamed Bougara Boumerdès; 2015. [cited 2021 Feb 27]. Available from: http://dlibrary.univ-boumerdes.dz:8080123456789/2097.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mouffok S. Etude de la photo-oxydation dans les conditions accélérées et naturelles des mélanges ternaires : Polypropylène /Polyamide-6/PP-g-MA. [Thesis]. Université M'Hamed Bougara Boumerdès; 2015. Available from: http://dlibrary.univ-boumerdes.dz:8080123456789/2097

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Oregon State University

2. Merrell, Mabel. Comparative performance of polypropylene and nylon hosiery using wear and laboratory tests.

Degree: MS, Clothing, Textiles and Related Arts, 1964, Oregon State University

URL: http://hdl.handle.net/1957/48273

► The purpose of this study was to compare the performance of hosiery made from a new fiber, polypropylene, with the performance of hosiery made from… (more)

▼ The purpose of this study was to compare the performance of hosiery made from a new fiber, polypropylene, with the performance of hosiery made from a better known fiber, nylon, and to get some indication of consumer reaction to a new textile product. Information was obtained through two wear tests and selected laboratory tests using different brands of hosiery with both fiber types represented. Two questionnaires were used as part of the wear tests. The first obtained information about the subjects and about some of their opinions concerning hosiery wear in general. The second questionnaire obtained information about the subjects' opinions concerning the hosiery worn in the wear tests. Thirty subjects participated in the first wear test with each wearing one pair of hosiery made of each fiber. Ten subjects participated in the second wear test, six of whom had also been part of the first test. The performance of the hosiery was checked by considering the number, severity and position of faults which occurred in relation to the number of days worn and by measuring to find the amount of stretch found in the worn hosiery. Laboratory tests were conducted to verify certain information obtained about the hosiery during the wear tests as well as to obtain further information about the hosiery. The questionnaires were analyzed by using percentages of the number responding to each part of each question. In this way, a general picture of the majority could be made to find out something about the subjects as a group and about their opinions of the hosiery. The wear life of the hosiery as shown by the number of days worn was related to the number of total faults found in the test hosiery. In addition, each type of fault, snags, runs, and abrasion marks, was considered. The two fiber types of hosiery were compared by testing to find if the differences between means were significant using F ratios. An additional check was made for covariance between the number of runs and the total days worn, and between the number of abrasion marks and the total days worn. All hosiery increased in width and decreased in length during the wear periods. The average amounts of dimensional change were analyzed by comparing the mean differences of the two fiber types of hosiery. The results were verified in the laboratory using a stretch and recovery test under controlled conditions. The differences in the means found in the laboratory test were checked for significance using F ratios. The rates of recovery were plotted on a time graph. An evaluation of the degree of fading was made by a panel of judges using a ranking system. The amount of, and the deviation from linear regression was found. Hosiery of both fiber types were washed in the laboratory and used as control groups to check with hosiery worn and washed by the subjects. Four laboratory tests were conducted to help describe the hosiery used in the study and to supply further information as to the differences in performance of hosiery made of… Advisors/Committee Members: Grant, Phyllis E. (advisor).

Subjects/Keywords: Polypropylene

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APA (6^th Edition):

Merrell, M. (1964). Comparative performance of polypropylene and nylon hosiery using wear and laboratory tests. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/48273

Chicago Manual of Style (16^th Edition):

Merrell, Mabel. “Comparative performance of polypropylene and nylon hosiery using wear and laboratory tests.” 1964. Masters Thesis, Oregon State University. Accessed February 27, 2021. http://hdl.handle.net/1957/48273.

MLA Handbook (7^th Edition):

Merrell, Mabel. “Comparative performance of polypropylene and nylon hosiery using wear and laboratory tests.” 1964. Web. 27 Feb 2021.

Vancouver:

Merrell M. Comparative performance of polypropylene and nylon hosiery using wear and laboratory tests. [Internet] [Masters thesis]. Oregon State University; 1964. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1957/48273.

Council of Science Editors:

Merrell M. Comparative performance of polypropylene and nylon hosiery using wear and laboratory tests. [Masters Thesis]. Oregon State University; 1964. Available from: http://hdl.handle.net/1957/48273

Oregon State University

3. Jeffers, Joyce Colleen. An evaluation of serviceability and consumer acceptance of pre-school boys' knit shirts made of blended polypropylene fabrics.

Degree: MS, Clothing, Textiles and Related Arts, 1969, Oregon State University

URL: http://hdl.handle.net/1957/46264

► This study was an evaluation of fabric serviceability and consumer acceptance of polypropylene blend knits. A review of literature indicates a trend toward polypropylene blend… (more)

Subjects/Keywords: Polypropylene

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jeffers, J. C. (1969). An evaluation of serviceability and consumer acceptance of pre-school boys' knit shirts made of blended polypropylene fabrics. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/46264

Chicago Manual of Style (16^th Edition):

Jeffers, Joyce Colleen. “An evaluation of serviceability and consumer acceptance of pre-school boys' knit shirts made of blended polypropylene fabrics.” 1969. Masters Thesis, Oregon State University. Accessed February 27, 2021. http://hdl.handle.net/1957/46264.

MLA Handbook (7^th Edition):

Jeffers, Joyce Colleen. “An evaluation of serviceability and consumer acceptance of pre-school boys' knit shirts made of blended polypropylene fabrics.” 1969. Web. 27 Feb 2021.

Vancouver:

Jeffers JC. An evaluation of serviceability and consumer acceptance of pre-school boys' knit shirts made of blended polypropylene fabrics. [Internet] [Masters thesis]. Oregon State University; 1969. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1957/46264.

Council of Science Editors:

Jeffers JC. An evaluation of serviceability and consumer acceptance of pre-school boys' knit shirts made of blended polypropylene fabrics. [Masters Thesis]. Oregon State University; 1969. Available from: http://hdl.handle.net/1957/46264

University of British Columbia

4. Manji, Aminmohamed. Electro synthesis of propylene oxide in a bipolar trickle bed reactor.

Degree: Master of Applied Science - MASc, Chemical and Biological Engineering, 1985, University of British Columbia

URL: http://hdl.handle.net/2429/25117

► The synthesis of propylene oxide by electrolysis of dilute sodium bromide solution with propylene gas was investigated in an electrochemical bipolar reactor consisting of six… (more)

Subjects/Keywords: Polypropylene

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APA (6^th Edition):

Manji, A. (1985). Electro synthesis of propylene oxide in a bipolar trickle bed reactor. (Masters Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/25117

Chicago Manual of Style (16^th Edition):

Manji, Aminmohamed. “Electro synthesis of propylene oxide in a bipolar trickle bed reactor.” 1985. Masters Thesis, University of British Columbia. Accessed February 27, 2021. http://hdl.handle.net/2429/25117.

MLA Handbook (7^th Edition):

Manji, Aminmohamed. “Electro synthesis of propylene oxide in a bipolar trickle bed reactor.” 1985. Web. 27 Feb 2021.

Vancouver:

Manji A. Electro synthesis of propylene oxide in a bipolar trickle bed reactor. [Internet] [Masters thesis]. University of British Columbia; 1985. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2429/25117.

Council of Science Editors:

Manji A. Electro synthesis of propylene oxide in a bipolar trickle bed reactor. [Masters Thesis]. University of British Columbia; 1985. Available from: http://hdl.handle.net/2429/25117

5. Juska, Thomas David. The mechanical behavior and deformation morphology of rubber-modified polypropylene.

Degree: Polymer Science & Engineering, 1982, University of Massachusetts

URL: https://scholarworks.umass.edu/theses/1650

Subjects/Keywords: Polymer; Polypropylene; Polypropylene

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APA (6^th Edition):

Juska, T. D. (1982). The mechanical behavior and deformation morphology of rubber-modified polypropylene. (Thesis). University of Massachusetts. Retrieved from https://scholarworks.umass.edu/theses/1650

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Juska, Thomas David. “The mechanical behavior and deformation morphology of rubber-modified polypropylene.” 1982. Thesis, University of Massachusetts. Accessed February 27, 2021. https://scholarworks.umass.edu/theses/1650.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Juska, Thomas David. “The mechanical behavior and deformation morphology of rubber-modified polypropylene.” 1982. Web. 27 Feb 2021.

Vancouver:

Juska TD. The mechanical behavior and deformation morphology of rubber-modified polypropylene. [Internet] [Thesis]. University of Massachusetts; 1982. [cited 2021 Feb 27]. Available from: https://scholarworks.umass.edu/theses/1650.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Juska TD. The mechanical behavior and deformation morphology of rubber-modified polypropylene. [Thesis]. University of Massachusetts; 1982. Available from: https://scholarworks.umass.edu/theses/1650

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Zambia

6. Mbiyana, Keegan M. Simulation of fatigue failure in Sisal and Kenaf reinforced polypropylene .

Degree: 2015, University of Zambia

URL: http://hdl.handle.net/123456789/4025

► Currently Fibre-Glass (FG) is the most widely used reinforcement in polymer composites. However, GF or fibre (|rassijs very expensive and non-biodegradable hence the need for… (more)

Subjects/Keywords: Polypropylene; Reinforced Plastics

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APA (6^th Edition):

Mbiyana, K. M. (2015). Simulation of fatigue failure in Sisal and Kenaf reinforced polypropylene . (Thesis). University of Zambia. Retrieved from http://hdl.handle.net/123456789/4025

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mbiyana, Keegan M. “Simulation of fatigue failure in Sisal and Kenaf reinforced polypropylene .” 2015. Thesis, University of Zambia. Accessed February 27, 2021. http://hdl.handle.net/123456789/4025.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mbiyana, Keegan M. “Simulation of fatigue failure in Sisal and Kenaf reinforced polypropylene .” 2015. Web. 27 Feb 2021.

Vancouver:

Mbiyana KM. Simulation of fatigue failure in Sisal and Kenaf reinforced polypropylene . [Internet] [Thesis]. University of Zambia; 2015. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/123456789/4025.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mbiyana KM. Simulation of fatigue failure in Sisal and Kenaf reinforced polypropylene . [Thesis]. University of Zambia; 2015. Available from: http://hdl.handle.net/123456789/4025

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

7. Vinay Kumar. Development and characterization of rice husk polypropylene composites; -.

Degree: Engineering, 2006, Punjab Technical University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/8965

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Due to non biodegradable nature of plastics, there is accumulation of these materials in the environment. Various means of its disposal such as recycling, incineration,… (more)

▼

Due to non biodegradable nature of plastics, there is accumulation of these materials in the environment. Various means of its disposal such as recycling, incineration, pyrolysis, biodegradation are available but these processes require lot of energy and time. Therefore utilization of waste plastics for making road and generation of fuels are the better options. Lignocellulosic materials such as rice husk, abundantly available in nature can be used with polypropylene (commodity plastics) for making thermoplastic composites. Use of rice husk in polypropylene reduce the cost and makes the composite material biodegradable. Poor compatibility between rice husk (hydrophilic) and polypropylene (hydrophobic) results lower mechanical strength in rice husk polypropylene composites. Therefore to make the effective utilization of these materials, addition of compatibilizer or coupling agent is must. In the present study, various properties such as mechanical, chemical, thermal of rice husk polypropylene (RHPP) composites have been studied. Earlier most of the work was focused on the use of compatibilizer and coupling agents for enhancing the mechanical properties, tensile strength in particular. Most commonly used compatibilizer was maleic anhydride polypropylene (MAPP), and coupling agents used were silnae, titanate and zirconate. Here emphasis have been given on detail studies of mechanical properties such as tensile strength, impact strength, modulus, hardness, and abrasion resistance of rice husk polypropylene (RHPP) composites for exploring the new applications. Use of fillers/additives affects the properties of plastics significantly. Therefore additives such as talc, silica, mica, calcium carbonate, wollastonite, and zirconium oxide have been selected and their effect on various properties such as mechanical, chemical and thermal of RHPP composites have been studied. In chapter one, effect of titanate coupling agent on the mechanical properties of RHPP composites was studied.

References p.116-131

Advisors/Committee Members: Singh, Manohar, Kanungo, B K, Sinha, Shishir.

Subjects/Keywords: Chemical Engineering; polypropylene

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APA (6^th Edition):

Kumar, V. (2006). Development and characterization of rice husk polypropylene composites; -. (Thesis). Punjab Technical University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/8965

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kumar, Vinay. “Development and characterization of rice husk polypropylene composites; -.” 2006. Thesis, Punjab Technical University. Accessed February 27, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/8965.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kumar, Vinay. “Development and characterization of rice husk polypropylene composites; -.” 2006. Web. 27 Feb 2021.

Vancouver:

Kumar V. Development and characterization of rice husk polypropylene composites; -. [Internet] [Thesis]. Punjab Technical University; 2006. [cited 2021 Feb 27]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/8965.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kumar V. Development and characterization of rice husk polypropylene composites; -. [Thesis]. Punjab Technical University; 2006. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/8965

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

North Carolina State University

8. Viswanath, Vidya. Degradation Studies of Polypropylene Fibers and Nonwovens with Prodegradant additives.

Degree: MS, Textile Engineering, 2010, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/6302

► The purpose of this research is to investigate an inexpensive pro-oxidant and pro-degradant additive system that can be applied during melt processing to produce biodegradable… (more)

Subjects/Keywords: additives; polypropylene; degradation

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APA (6^th Edition):

Viswanath, V. (2010). Degradation Studies of Polypropylene Fibers and Nonwovens with Prodegradant additives. (Thesis). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/6302

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Viswanath, Vidya. “Degradation Studies of Polypropylene Fibers and Nonwovens with Prodegradant additives.” 2010. Thesis, North Carolina State University. Accessed February 27, 2021. http://www.lib.ncsu.edu/resolver/1840.16/6302.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Viswanath, Vidya. “Degradation Studies of Polypropylene Fibers and Nonwovens with Prodegradant additives.” 2010. Web. 27 Feb 2021.

Vancouver:

Viswanath V. Degradation Studies of Polypropylene Fibers and Nonwovens with Prodegradant additives. [Internet] [Thesis]. North Carolina State University; 2010. [cited 2021 Feb 27]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/6302.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Viswanath V. Degradation Studies of Polypropylene Fibers and Nonwovens with Prodegradant additives. [Thesis]. North Carolina State University; 2010. Available from: http://www.lib.ncsu.edu/resolver/1840.16/6302

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

9. Soma, Hirokazu. 結晶形態と分子配向状態を制御したポリプロピレン射出成形体の設計.

Degree: Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学

URL: http://hdl.handle.net/10119/11257

Supervisor:山口政之

マテリアルサイエンス研究科

修士

Subjects/Keywords: ポリプロピレン; polypropylene

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APA (6^th Edition):

Soma, H. (n.d.). 結晶形態と分子配向状態を制御したポリプロピレン射出成形体の設計. (Thesis). Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学. Retrieved from http://hdl.handle.net/10119/11257

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Soma, Hirokazu. “結晶形態と分子配向状態を制御したポリプロピレン射出成形体の設計.” Thesis, Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学. Accessed February 27, 2021. http://hdl.handle.net/10119/11257.

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Soma, Hirokazu. “結晶形態と分子配向状態を制御したポリプロピレン射出成形体の設計.” Web. 27 Feb 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Soma H. 結晶形態と分子配向状態を制御したポリプロピレン射出成形体の設計. [Internet] [Thesis]. Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学; [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10119/11257.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

Council of Science Editors:

Soma H. 結晶形態と分子配向状態を制御したポリプロピレン射出成形体の設計. [Thesis]. Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学; Available from: http://hdl.handle.net/10119/11257

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

University of Alberta

10. Khademi, Fatemeh. Characterization of the Effect of Recycled Polypropylene Using DOE.

Degree: MS, Department of Mechanical Engineering, 2015, University of Alberta

URL: https://era.library.ualberta.ca/files/qf85nf11m

► Polypropylene (PP) is a thermoplastic polymer and is one of the most widely used polyolefin polymer, which is a well-known semi crystalline polymer. Plastics such… (more)

▼ Polypropylene (PP) is a thermoplastic polymer and is one of the most widely used polyolefin polymer, which is a well-known semi crystalline polymer. Plastics such as polypropylene are commonly used for different applications and purposes due to their versatility; however, it should be noted that our current approaches in plastic product production, consumption and disposal are not sustainable and causes concerns for environment and human health. Hence, appropriate use and disposal, especially recycling has an essential role. There are several studies investigating the chemical and mechanical properties of polypropylene; and also there are a few studies on the effects of multiple recycling on chemical and mechanical behavior of polypropylene; however, there are relatively few investigations involving combination of virgin and recycled polypropylene. To more accurately investigate the effects of the addition of different percentage of recycled polypropylene on tensile properties of polypropylene this study was conducted. Also the effects of annealing and glass fiber additive on recycled content polypropylene are investigated in this study. Cold temperature effect on polypropylene properties also investigated (due to environmental conditions in Edmonton). Hence, using design of experiment (DOE) methods, the effects of all these factors on tensile behavior of polypropylene is carried out in detail. Also a wide angle X-ray diffraction (WAXD) system is used to investigate on crystalline structure of the recycled content polypropylene samples to better explain their tensile behavior. Furthermore, drop test simulations are performed on a sample box, using the measured tensile properties at room temperature as a case study. Based on the current experimental study, and combination with the literature reviews, it is concluded that recycled material could be use without detrimental effect on the material properties of polypropylene. Guidelines of this study could be useful for further studies on different materials or more combinations. The comprehensive tensile results obtained through this study are valuable for plastic industries and designers, which could be helpful to reduce industries, cost of material and also recycling is one of the most environmental friendly ways to dispose plastics. Combination of DOE methods and statistical analysis with tensile experiments and FEA simulations makes a powerful method which could be used as a guideline for further studies, other researchers, industries and designers to reduce cost and plastic production.

Subjects/Keywords: Recycled; Polypropylene; DOE; Mechanical properties

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APA (6^th Edition):

Khademi, F. (2015). Characterization of the Effect of Recycled Polypropylene Using DOE. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/qf85nf11m

Chicago Manual of Style (16^th Edition):

Khademi, Fatemeh. “Characterization of the Effect of Recycled Polypropylene Using DOE.” 2015. Masters Thesis, University of Alberta. Accessed February 27, 2021. https://era.library.ualberta.ca/files/qf85nf11m.

MLA Handbook (7^th Edition):

Khademi, Fatemeh. “Characterization of the Effect of Recycled Polypropylene Using DOE.” 2015. Web. 27 Feb 2021.

Vancouver:

Khademi F. Characterization of the Effect of Recycled Polypropylene Using DOE. [Internet] [Masters thesis]. University of Alberta; 2015. [cited 2021 Feb 27]. Available from: https://era.library.ualberta.ca/files/qf85nf11m.

Council of Science Editors:

Khademi F. Characterization of the Effect of Recycled Polypropylene Using DOE. [Masters Thesis]. University of Alberta; 2015. Available from: https://era.library.ualberta.ca/files/qf85nf11m

Mahatma Gandhi University

11. Jose, Seno. Compatibilisation of polypropylene/high density polyethylene and polypropylene/polyamide 12 blends.

Degree: 2010, Mahatma Gandhi University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/517

Glossary included Advisors/Committee Members: Thomas, Sabu, Mathew, Chandy C.

Subjects/Keywords: Polypropylene; Polyamide

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APA (6^th Edition):

Jose, S. (2010). Compatibilisation of polypropylene/high density polyethylene and polypropylene/polyamide 12 blends. (Thesis). Mahatma Gandhi University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/517

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jose, Seno. “Compatibilisation of polypropylene/high density polyethylene and polypropylene/polyamide 12 blends.” 2010. Thesis, Mahatma Gandhi University. Accessed February 27, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/517.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jose, Seno. “Compatibilisation of polypropylene/high density polyethylene and polypropylene/polyamide 12 blends.” 2010. Web. 27 Feb 2021.

Vancouver:

Jose S. Compatibilisation of polypropylene/high density polyethylene and polypropylene/polyamide 12 blends. [Internet] [Thesis]. Mahatma Gandhi University; 2010. [cited 2021 Feb 27]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/517.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jose S. Compatibilisation of polypropylene/high density polyethylene and polypropylene/polyamide 12 blends. [Thesis]. Mahatma Gandhi University; 2010. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/517

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Stellenbosch University

12. Parku, George Kofi. Pyrolysis of waste polypropylene plastics for energy recovery: Investigation of operating parameters and process development at pilot scale.

Degree: MEng, Process Engineering, 2019, Stellenbosch University

URL: http://hdl.handle.net/10019.1/106208

► ENGLISH ABSTRACT: Polypropylene (PP) has been identified as the second most abundant plastic waste in landfills globally and the fastest growing plastic waste in South… (more)

▼ ENGLISH ABSTRACT: Polypropylene (PP) has been identified as the second most abundant plastic waste in landfills globally and the fastest growing plastic waste in South Africa. The increasing numbers have been attributed to the limitation of conventional mechanical recycling not being able to handle plastic wastes contaminated with other organic wastes. Recycling via pyrolysis has been identified as a promising option to managing these plastic wastes due to its ability to handle significant levels of contamination and also yielding products with huge fuel prospects from plastics. Pyrolysis under vacuum conditions for other organic wastes such as biomass has demonstrated promising yields of condensable products. Unfortunately, pyrolysis of plastics under vacuum has received very little attention. Also, transition from bench to industrial scale applications of pyrolysis processes could be complicated and pilot scale processes to mediate between both levels are very helpful towards attaining the sustainable commercialisation of plastics pyrolysis into fuels. The aim of the study was to investigate the effects of key process parameters (that include temperature and heating rate) on products yield distribution and quality of condensable products from the pyrolysis of waste PP plastics at bench scale under atmospheric and vacuum conditions. Four temperatures (450, 488, 525 and 600 ᵒC) were investigated at two distinct heating rates of 15 ᵒC/min (slow), 175 ᵒC/min (fast). As part of the aims of the study, a 5 kg/h pyrolysis pilot plant was also designed and commissioned after which tests obtained from atmospheric fast heating rates were scaled-up to the commissioned pilot. Pyrolysis of PP under atmospheric slow and fast heating rates revealed maximum condensable products (oil and wax) yields of 85.6 and 84.5 wt.% respectively all attained at 488 ᵒC after which further increase of temperature resulted in secondary cracking reactions which promoted yields of permanent gases against condensables. Cracking was however more severe under fast heating rates due to the combined effects of higher temperature and faster heating rate. Gas Chromatography/ Mass Spectrometry (GC/MS) analysis of condensable products obtained under these conditions also revealed that production of gasoline range compounds was favoured mostly under reactions where some cracking reactions occur. Also, Higher Heating Values (HHVs) of condensable products recovered under atmospheric conditions ranged between 41 - 45 MJ/kg. HHVs were however seen to decrease at severe temperature and heating rate conditions due to the increased production of aromatics. Maximum yields of condensable products for slow and fast heating rates under vacuum conditions were reported to be 92.7 wt.% (at 525 ᵒC) and 91.8 wt.% (at 488 ᵒC) respectively. Total yields of condensable products under vacuum were observed to be higher than the corresponding yields under atmospheric conditions. Unlike atmospheric conditions, diesel range compounds predominated all condensable products… Advisors/Committee Members: Gorgens, Johann F., Stellenbosch University. Faculty of Engineering. Dept. of Process Engineering..

Subjects/Keywords: Pyrolysis; Polypropylene; Fuel; Vacuum; UCTD

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APA (6^th Edition):

Parku, G. K. (2019). Pyrolysis of waste polypropylene plastics for energy recovery: Investigation of operating parameters and process development at pilot scale. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/106208

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Parku, George Kofi. “Pyrolysis of waste polypropylene plastics for energy recovery: Investigation of operating parameters and process development at pilot scale.” 2019. Thesis, Stellenbosch University. Accessed February 27, 2021. http://hdl.handle.net/10019.1/106208.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Parku, George Kofi. “Pyrolysis of waste polypropylene plastics for energy recovery: Investigation of operating parameters and process development at pilot scale.” 2019. Web. 27 Feb 2021.

Vancouver:

Parku GK. Pyrolysis of waste polypropylene plastics for energy recovery: Investigation of operating parameters and process development at pilot scale. [Internet] [Thesis]. Stellenbosch University; 2019. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10019.1/106208.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Parku GK. Pyrolysis of waste polypropylene plastics for energy recovery: Investigation of operating parameters and process development at pilot scale. [Thesis]. Stellenbosch University; 2019. Available from: http://hdl.handle.net/10019.1/106208

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

13. Rife, Nathan Prentice. Tacticity control of polypropylene using a C2-symmetric family of catalysts.

Degree: MS, Chemistry, 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2029

► A family of C2-symmetric catalysts was designed and synthesized with the intent to polymerize propylene. The catalyst was designed to be C2-symmetric for the specific… (more)

Subjects/Keywords: Polypropylene; Tacticity

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APA (6^th Edition):

Rife, N. P. (2009). Tacticity control of polypropylene using a C2-symmetric family of catalysts. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2029

Chicago Manual of Style (16^th Edition):

Rife, Nathan Prentice. “Tacticity control of polypropylene using a C2-symmetric family of catalysts.” 2009. Masters Thesis, Texas A&M University. Accessed February 27, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2029.

MLA Handbook (7^th Edition):

Rife, Nathan Prentice. “Tacticity control of polypropylene using a C2-symmetric family of catalysts.” 2009. Web. 27 Feb 2021.

Vancouver:

Rife NP. Tacticity control of polypropylene using a C2-symmetric family of catalysts. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2029.

Council of Science Editors:

Rife NP. Tacticity control of polypropylene using a C2-symmetric family of catalysts. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2029

University of Johannesburg

14. Tu, Lin. Development of surface fluorinated polypropylene fibres for use in concrete.

Degree: 2014, University of Johannesburg

URL: http://hdl.handle.net/10210/9436

►

D.Ing. (Civil Engineering)

Polypropylene (PP) fibre is one of the most widely used fibres for reinforcing concrete. Due to its unique material properties such as… (more)

▼

D.Ing. (Civil Engineering)

Polypropylene (PP) fibre is one of the most widely used fibres for reinforcing concrete. Due to its unique material properties such as economic production cost, relatively high melting point and alkaline resistance, PP fibres in concrete are found to increase the toughness, provide restrained plastic and drying shrinkage cracking resistance, increase impact resistance and flexural loading capacity (especially during the post-crack stage) of concrete structures and components. The wettability of PP fibre surfaces is poor due to the hydrophobic surface nature of polypropylene. The bonding between the PP fibre and the concrete matrix is recognized as poor and currently the PP fibre / concrete interfacial bonding depends upon interlocking and keying (mechanical bonding). As the interfacial bond strength between the PP fibre and the concrete is much smaller than the tensile strength of PP fibre and concrete, in order to fully explore the reinforcing effect of PP fibres in concrete, further improvement of interfacial bonding is necessary. In this investigation, the research work was conducted on the surface oxyfluorinated PP fibre newly developed by the Atomic Energy Corporation of South Africa Limited. Examining the feasibility of using this fibre in concrete, as well as evaluating its superiority over unmodified PP fibres, is the key task of this investigation. This new type of oxyfluorinated PP fibre shows a large increase in interfacial bond strength compared to the unmodified PP fibres. The surface free energy concept and Lewis acid-base interfacial interaction theory were innovatively used to examine the interfacial bonding between the PP fibre and the concrete matrix. The purpose of this study was to develop the background of such oxyfluorinated PP fibres, to establish the mechanism of the increase in interfacial bonding and to investigate the basic properties of the concrete incorporating oxyfluorinated PP fibres. The experimental results on the properties of oxyfluorinated PP fibre reinforced concrete compared with those of unmodified PP fibre reinforced concrete and plain concrete are presented, with some field test results focused on the improvement in shrinkage cracking control capacity. It is concluded in this investigation that the surface oxyfluorinated PP fibres possess significantly increased PP fibre / concrete interfacial bonding due to the chemical bond arising from the acid base interfacial interaction and the intimate interfacial contact arising from the improved fibre surface wettability. When combining oxyfluorinated pp fibre with concrete, a general improvement in the physical and mechanical properties of fibrous concrete compared to that created with unmodified PP fibres, is obtained.

Subjects/Keywords: Reinforced concrete; Polypropylene fibers

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APA (6^th Edition):

Tu, L. (2014). Development of surface fluorinated polypropylene fibres for use in concrete. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/9436

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tu, Lin. “Development of surface fluorinated polypropylene fibres for use in concrete.” 2014. Thesis, University of Johannesburg. Accessed February 27, 2021. http://hdl.handle.net/10210/9436.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tu, Lin. “Development of surface fluorinated polypropylene fibres for use in concrete.” 2014. Web. 27 Feb 2021.

Vancouver:

Tu L. Development of surface fluorinated polypropylene fibres for use in concrete. [Internet] [Thesis]. University of Johannesburg; 2014. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10210/9436.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tu L. Development of surface fluorinated polypropylene fibres for use in concrete. [Thesis]. University of Johannesburg; 2014. Available from: http://hdl.handle.net/10210/9436

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Georgia Tech

15. Rice, Donald Lester. Diffusion and solubility of methane in polypropylene melts.

Degree: MS, Textile Engineering, 1974, Georgia Tech

URL: http://hdl.handle.net/1853/9137

Subjects/Keywords: Polypropylene; Methane

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APA (6^th Edition):

Rice, D. L. (1974). Diffusion and solubility of methane in polypropylene melts. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/9137

Chicago Manual of Style (16^th Edition):

Rice, Donald Lester. “Diffusion and solubility of methane in polypropylene melts.” 1974. Masters Thesis, Georgia Tech. Accessed February 27, 2021. http://hdl.handle.net/1853/9137.

MLA Handbook (7^th Edition):

Rice, Donald Lester. “Diffusion and solubility of methane in polypropylene melts.” 1974. Web. 27 Feb 2021.

Vancouver:

Rice DL. Diffusion and solubility of methane in polypropylene melts. [Internet] [Masters thesis]. Georgia Tech; 1974. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1853/9137.

Council of Science Editors:

Rice DL. Diffusion and solubility of methane in polypropylene melts. [Masters Thesis]. Georgia Tech; 1974. Available from: http://hdl.handle.net/1853/9137

Queens University

16. Petrie, Kyle. Composites of Multi-Walled Carbon Nanotubes With Polypropylene and Thermoplastic Olefin Blends Prepared by Melt Compounding .

Degree: Chemical Engineering, 2013, Queens University

URL: http://hdl.handle.net/1974/8371

► Composites of multi-walled carbon nanotubes (MWCNTs) with polypropylene (PP) and thermoplastic olefins (TPOs) were prepared by melt compounding. Two non-covalent functionalization methods were employed to… (more)

▼ Composites of multi-walled carbon nanotubes (MWCNTs) with polypropylene (PP) and thermoplastic olefins (TPOs) were prepared by melt compounding. Two non-covalent functionalization methods were employed to improve nanotube dispersion and the resulting composite properties are reported. The first functionalization approach involved partial coating of the surface of the nanotubes with a hyperbranched polyethylene (HBPE). MWCNT functionalization with HBPE was only moderately successful in breaking up the large aggregates that formed upon melt mixing with PP. In spite of the formation of large aggregates, the samples were conductive above a percolation threshold of 7.3 wt%. MWCNT functionalization did not disrupt the electrical conductivity of the nanotubes. The composite strength was improved with addition of nanotubes, but ductility was severely compromised because of the existence of aggregates. The second method involved PP matrix functionalization with aromatic moieties capable of π-π interaction with MWCNT sidewalls. Various microscopy techniques revealed the addition of only 25 wt% of PP-g-pyridine (Py) to the neat PP was capable of drastically reducing nanotube aggregate size and amount. Raman spectroscopy confirmed improved polymer/nanotube interaction with the PP-g-Py matrix. Electrical percolation threshold was obtained at a MWCNT loading of approximately 1.2 wt%. Electrical conductivity on the order of 10-2 S/m was achieved, suggesting possible use in semi-conducting applications. Composite strength was improved upon addition of MWCNTs. The matrix functionalization with Py resulted in a significant improvement in composite ductility when filled with MWCNTs in comparison to its maleic anhydride (MA) counterpart. Preliminary investigations suggest that the use of alternating current (AC) electric fields may be effective in aligning nanotubes in PP to reduce the filler loading required for electrical percolation. Composites containing MWCNT within PP/ethylene-octene copolymer (EOC) blends were prepared. Microscopy revealed that MWCNTs localized preferentially in the EOC phase. This was explained by the tendency of the system to minimize interfacial energy when the MWCNTs reside in the thermodynamically preferential phase. A kinetic approach, which involved pre-mixing the MWCNTs with PP and adding the EOC phase subsequently was attempted to monitor the migration of MWCNTs. MWCNTs began to migrate after two minutes of melt mixing with the EOC. The PP-g-Py matrix functionalization appears to slightly delay the migration. A reduction in electrical percolation threshold to 0.5 wt% MWCNTs was achieved with a co-continuous blend morphology, consisting of a 50/50 by weight ratio of PP and EOC.

Subjects/Keywords: Nanocomposites ; Blends ; Polypropylene ; Carbon nanotubes

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APA (6^th Edition):

Petrie, K. (2013). Composites of Multi-Walled Carbon Nanotubes With Polypropylene and Thermoplastic Olefin Blends Prepared by Melt Compounding . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/8371

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Petrie, Kyle. “Composites of Multi-Walled Carbon Nanotubes With Polypropylene and Thermoplastic Olefin Blends Prepared by Melt Compounding .” 2013. Thesis, Queens University. Accessed February 27, 2021. http://hdl.handle.net/1974/8371.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Petrie, Kyle. “Composites of Multi-Walled Carbon Nanotubes With Polypropylene and Thermoplastic Olefin Blends Prepared by Melt Compounding .” 2013. Web. 27 Feb 2021.

Vancouver:

Petrie K. Composites of Multi-Walled Carbon Nanotubes With Polypropylene and Thermoplastic Olefin Blends Prepared by Melt Compounding . [Internet] [Thesis]. Queens University; 2013. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1974/8371.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Petrie K. Composites of Multi-Walled Carbon Nanotubes With Polypropylene and Thermoplastic Olefin Blends Prepared by Melt Compounding . [Thesis]. Queens University; 2013. Available from: http://hdl.handle.net/1974/8371

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Nelson Mandela Metropolitan University

17. Mosia, Lefika Ellen. Physical and thermal properties of binary and ternary blends of polypropylene, crumb rubber and wood flour.

Degree: 2020, Nelson Mandela Metropolitan University

URL: http://hdl.handle.net/10948/49193

► The properties of binary and ternary blends of polypropylene (PP), crumb rubber (CR) and wood flour (WF), with and without ethylene-1-butene as a compatibiliser, were… (more)

▼ The properties of binary and ternary blends of polypropylene (PP), crumb rubber (CR) and wood flour (WF), with and without ethylene-1-butene as a compatibiliser, were studied. The design of experiment (DoE) was used to determine the proportions of each component for various composites. The components were mixed using the Haake Thermo scientific Polylab QC internal mixer and the crumbs were then moulded into different shapes using the ARBURG 221-55-250 injection moulding machine. The properties of the blends were investigated using a scanning electron microscope (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanic analysis (DMA), tensile tester, water absorption and thickness swelling tests. The morphology of the blends showed the agglomeration of fillers (CR and WF) and more voids on untreated blends but on the treated blends fewer voids as well as improved distribution and dispersion were observed. PP bonded better with WF than with CR. The incorporation of both fillers improved the thermal stability, glass transition temperature, and melt temperature as well as crystallisation temperatures of the blends. Yet these fillers reduced the tensile strength and the yield strength of PP. The addition of WF increased the elongation at break and hardness of the blends but decreased the impact strength of the blends, whereas the addition of CR improved the elongation at break and impact strength of the blends and decreased the hardness of the blends. The blends with more WF absorbed more water and swelled more than the blends containing a high amount of CR. The incorporation of compatibiliser further decreased the tensile strength but improved the thermal stability and elongation at break of the blends. The water absorption and swelling of the blends seemed to decrease with the addition of the compatibiliser whereas the hardness increased. The impact strength of the blends containing more WF, increased after the addition of compatibiliser. The ternary blends showed better results than the binary blends.

Subjects/Keywords: Polypropylene; Polymers; Materials science

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APA (6^th Edition):

Mosia, L. E. (2020). Physical and thermal properties of binary and ternary blends of polypropylene, crumb rubber and wood flour. (Thesis). Nelson Mandela Metropolitan University. Retrieved from http://hdl.handle.net/10948/49193

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mosia, Lefika Ellen. “Physical and thermal properties of binary and ternary blends of polypropylene, crumb rubber and wood flour.” 2020. Thesis, Nelson Mandela Metropolitan University. Accessed February 27, 2021. http://hdl.handle.net/10948/49193.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mosia, Lefika Ellen. “Physical and thermal properties of binary and ternary blends of polypropylene, crumb rubber and wood flour.” 2020. Web. 27 Feb 2021.

Vancouver:

Mosia LE. Physical and thermal properties of binary and ternary blends of polypropylene, crumb rubber and wood flour. [Internet] [Thesis]. Nelson Mandela Metropolitan University; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10948/49193.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mosia LE. Physical and thermal properties of binary and ternary blends of polypropylene, crumb rubber and wood flour. [Thesis]. Nelson Mandela Metropolitan University; 2020. Available from: http://hdl.handle.net/10948/49193

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Anna University

18. Nagasankar P. Dynamic characteristics of fiber reinforced polymer composite with and without interleaving of polypropylene honeycomb structure;.

Degree: Dynamic characteristics of fiber reinforced polymer composite with and without interleaving of polypropylene honeycomb structure, 2015, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/49371

►

In this research work the dynamic characteristics of fiber reinforced polymer FRP composites under the influence of various factors have been investigated from the theoretical… (more)

Subjects/Keywords: Fiber reinforced polymer; honeycomb structure; Mechanical engineering; Polypropylene; Polypropylene honeycomb structure

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APA (6^th Edition):

P, N. (2015). Dynamic characteristics of fiber reinforced polymer composite with and without interleaving of polypropylene honeycomb structure;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/49371

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

P, Nagasankar. “Dynamic characteristics of fiber reinforced polymer composite with and without interleaving of polypropylene honeycomb structure;.” 2015. Thesis, Anna University. Accessed February 27, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/49371.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

P, Nagasankar. “Dynamic characteristics of fiber reinforced polymer composite with and without interleaving of polypropylene honeycomb structure;.” 2015. Web. 27 Feb 2021.

Vancouver:

P N. Dynamic characteristics of fiber reinforced polymer composite with and without interleaving of polypropylene honeycomb structure;. [Internet] [Thesis]. Anna University; 2015. [cited 2021 Feb 27]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/49371.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

P N. Dynamic characteristics of fiber reinforced polymer composite with and without interleaving of polypropylene honeycomb structure;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/49371

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

19. Yamazaki, Atsuro. 多孔質ポリプロピレンフィルムの材料設計.

Degree: Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学

URL: http://hdl.handle.net/10119/11945

Supervisor:山口政之教授

マテリアルサイエンス研究科

修士

Subjects/Keywords: Polypropylene; Nucleating agent

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APA (6^th Edition):

Yamazaki, A. (n.d.). 多孔質ポリプロピレンフィルムの材料設計. (Thesis). Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学. Retrieved from http://hdl.handle.net/10119/11945

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yamazaki, Atsuro. “多孔質ポリプロピレンフィルムの材料設計.” Thesis, Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学. Accessed February 27, 2021. http://hdl.handle.net/10119/11945.

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yamazaki, Atsuro. “多孔質ポリプロピレンフィルムの材料設計.” Web. 27 Feb 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Yamazaki A. 多孔質ポリプロピレンフィルムの材料設計. [Internet] [Thesis]. Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学; [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10119/11945.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

Council of Science Editors:

Yamazaki A. 多孔質ポリプロピレンフィルムの材料設計. [Thesis]. Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学; Available from: http://hdl.handle.net/10119/11945

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

Stellenbosch University

20. De Goede, Elana. The development of analytical techniques for studying degradation in impact polypropylene copolymers.

Degree: Chemistry and Polymer Science, 2009, Stellenbosch University

URL: http://hdl.handle.net/10019.1/1162

►

Thesis (DSc (Chemistry and Polymer Science)) – University of Stellenbosch, 2009.

Unstabilised polyolefins are susceptible to degradation when exposed to molecular oxygen, heat, irradiation as well… (more)

▼

Thesis (DSc (Chemistry and Polymer Science)) – University of Stellenbosch, 2009.

Unstabilised polyolefins are susceptible to degradation when exposed to molecular oxygen, heat, irradiation as well as chemical and mechanical stimuli. Oxidation leads to changes in molecular properties such as molecular weight, molecular weight distribution, chemical composition, chemical composition distribution and crystallisability. Conventional analytical techniques are of limited use when studying the degradation of heterogeneous materials such as impact polypropylene copolymers (ICPP). These copolymers consist of a number of components of different monomer contents, isotacticity and crystallinity, ranging from amorphous EPR to highly crystalline polypropylene. The individual components are affected differently by degradation, leading to heterogeneity within the degradation of impact copolymers. Novel analytical approaches that acknowledge the heterogeneity in sample composition are needed to study the degradation behaviour of such heterogeneous materials. This study describes the combination of fractionation and hyphenated techniques with conventional analyses for extensive structural characterisation of complex impact copolymers as well as their degradation behaviour. Temperature rising elution fractionation (TREF) coupled to conventional techniques such as size exclusion chromatography (SEC), Fourier-Transform infrared spectroscopy (FTIR), Carbon-13 nuclear magnetic resonance (13C-NMR) and differential scanning calorimetry (DSC) indicated the ICPPs in question to consist of four main components, namely ethylene-propylene random copolymers (EPR), isotactic PP (iPP), as well as semi-crystalline ethylene-propylene copolymers (EPC) and lower isotacticity PP. The degradation of an ICPP was studied by a multi-component analysis procedure consisting of TREF coupled to SEC, 13C-NMR, as well as SEC-FTIR. Results obtained by this procedure indicated the change in crystallisability of the bulk sample observed by TREF, crystallisation analysis fractionation (CRYSTAF) and DSC to be the result of the preferential degradation of the iPP phase. Degradation of ICPPs initiates within this phase where chain scission and carbonyl group insertion leads to a change in the crystallisability of iPP chains. During TREF of degraded bulk ICPPs, the degraded iPP molecules elute at lower elution temperatures, depending on their degree of degradation. The other components of the copolymer were degraded to a lesser extent. Degradation products were also found to be heterogeneously distributed across the molecular weight distribution of each fraction, with a higher concentration appearing at the low molecular weight side. The multi-component analysis procedure was also used to study the difference in degradation behaviour between ICPPs of different comonomer content, isotacticity and crystallinity. The spatial heterogeneity of degradation within ICPPs was studied by Fourier-Transform infrared microspectroscopy (FTIR-μS). A heterogeneous distribution of…

Advisors/Committee Members: Pasch, Harald, Mallon, P. E., University of Stellenbosch. Faculty of Science. Dept. of Chemistry and Polymer Science..

Subjects/Keywords: Polymer science; Polypropylene

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APA (6^th Edition):

De Goede, E. (2009). The development of analytical techniques for studying degradation in impact polypropylene copolymers. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/1162

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

De Goede, Elana. “The development of analytical techniques for studying degradation in impact polypropylene copolymers.” 2009. Thesis, Stellenbosch University. Accessed February 27, 2021. http://hdl.handle.net/10019.1/1162.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

De Goede, Elana. “The development of analytical techniques for studying degradation in impact polypropylene copolymers.” 2009. Web. 27 Feb 2021.

Vancouver:

De Goede E. The development of analytical techniques for studying degradation in impact polypropylene copolymers. [Internet] [Thesis]. Stellenbosch University; 2009. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10019.1/1162.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

De Goede E. The development of analytical techniques for studying degradation in impact polypropylene copolymers. [Thesis]. Stellenbosch University; 2009. Available from: http://hdl.handle.net/10019.1/1162

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Stellenbosch University

21. Pretorius, Marius Stefan. Characterization of molecular properties of propylene impact copolymers.

Degree: MSc, Chemistry and Polymer Science, 2007, Stellenbosch University

URL: http://hdl.handle.net/10019.1/50695

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ENGLISH ABSTRACT: This study involves the fractionation and characterization of five propylene impact copolymers as well as the use of preparative temperature rising elution fractionation… (more)

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ENGLISH ABSTRACT: This study involves the fractionation and characterization of five propylene impact copolymers as well as the use of preparative temperature rising elution fractionation (prep-TREF) to study batch consistency. The fractionation technique used in the study was prep-TREF. The prep-TREF fractions were subsequently analysed off-line by crystallization analysis fractionation (CRYSTAF), differential scanning calorimetry (DSC), 13C nuclear magnetic resonance {1 3 C NMR) and high-temperature gel-permeation chromatography (HT-GPC). The molecular heterogeneity of these copolymers was illustrated, while optimizing the fractionation technique. Also propylene impact copolymers that seem similar, as well as obviously different in molecular make-up, were compared to illustrate batch consistency. The results for the original polymers show that the ethylene content, as determined by 13C NMR, was significantly different from that claimed by the manufacturers. CRYSTAF analyses indicated differences between two seemingly similar polymers from different batches. The prep-TREF technique was optimized for these materials, particularly with respect to the elution temperatures and temperature intervals of these materials. Up to 15 clearly identifiable fractions, of which 7 comprised about 90 % of the total weight of the polymer fractionated, were obtained. Three major components were isolated from each of the polymers. These were ethylene-propylene-rubber, EPR, (50 - 60 mole %), propylene homopolymer and ethylene-rich copolymers. The EPR was non-crystalline and largely present in the fractions isolated at elution temperatures of 25 and 50 °C. Most of the ethylene in the copolymers is present as EPR. An increase in the ethylene content does correspondingly increase the rubbery, soluble part of the polymer. PrepTREF was shown to be a useful technique to compare very complex materials such as the propylene impact copolymers.

AFRIKAANSE OPSOMMING: Hierdie navorsing behels die fraksionering en karakterisering van vyf propileen impak kopolimere, sowel as die gebruik van preparatiewe temperatuutstyging eluering fraksionering (prep-TREF) om bondel ooreenstemming the bestudeer. Die fraksionerings tegniek wat gebruik is in die navorsing is prep-TREF. Die prep-TREF fraksies was geanaliseer deur kristallisasie analise fraksionering (CRYSTAF), differensiele skandeer kalorimetrie (DSC), 13C kem magnetiese resonans spektroskopie ( 13C NMR) en hoetemperatuur jel-permeasie kromatografie (HT-GPC). Die molekulere heterogeniteit van die kopolimere was ook gei1lustreer, terwyl die fraksionerings tegniek geoptimaliseer was. Ook, die propileen impak kopolimere wat eenders voorkom, sowel as totaal en al verskillend is in molekulere samestelling, is vergelyk om bondel ooreenstemming te illustreer. Die resultate vir die oorspronklike polimere het gewys dat die etileen inhoud, soos bepaal deur 13C NMR, verskil het van dit wat die vervaardigers aanspraak op maak. CRYSTAF analise het verskille opgelewer tussen…

Advisors/Committee Members: Van Reenen, A. J., Stellenbosch University. Faculty of Science. Dept. of Chemistry and Polymer Science.

Subjects/Keywords: Polypropylene; Dissertations – Chemistry

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APA (6^th Edition):

Pretorius, M. S. (2007). Characterization of molecular properties of propylene impact copolymers. (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/50695

Chicago Manual of Style (16^th Edition):

Pretorius, Marius Stefan. “Characterization of molecular properties of propylene impact copolymers.” 2007. Masters Thesis, Stellenbosch University. Accessed February 27, 2021. http://hdl.handle.net/10019.1/50695.

MLA Handbook (7^th Edition):

Pretorius, Marius Stefan. “Characterization of molecular properties of propylene impact copolymers.” 2007. Web. 27 Feb 2021.

Vancouver:

Pretorius MS. Characterization of molecular properties of propylene impact copolymers. [Internet] [Masters thesis]. Stellenbosch University; 2007. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10019.1/50695.

Council of Science Editors:

Pretorius MS. Characterization of molecular properties of propylene impact copolymers. [Masters Thesis]. Stellenbosch University; 2007. Available from: http://hdl.handle.net/10019.1/50695

University of Waterloo

22. Mutyala, Prashant. Preparation of Thermoplastic Vulcanizates from Devulcanized Rubber and Polypropylene.

Degree: 2013, University of Waterloo

URL: http://hdl.handle.net/10012/7420

► One of the current problems faced by mankind is the problem of safe disposal of waste rubber. Statistics show that the number of waste tires… (more)

▼ One of the current problems faced by mankind is the problem of safe disposal of waste rubber. Statistics show that the number of waste tires is continuously increasing at a very rapid rate. Since rubber materials do not decompose easily (due to their crosslinked structure), they end up being a serious ‘environmental problem’. An intuitive solution to prevent the accumulation of the scrap tires is to continuously reuse them. A new patented reclamation method was discovered in our laboratory, which makes use of a twin screw extruder (TSE) in order to produce reclaimed rubber (referred as devulcanized rubber (DR) from here on) of very high quality. Also, this method has proven to be more economical than other commercial reclaiming methods. Products made solely from a reclaimed material face challenges from those made by virgin materials because of relatively poor properties. However, the striking advantage of using reclaimed rubbers is the cost reduction. Hence, it is important to work on establishing methods by which these reclaimed rubbers could be efficiently used and incorporated into present day products. The deterioration of properties could be minimized by blending them with varying amounts of other materials. A possibility in this direction is manufacturing of thermoplastic vulcanizates (TPVs) using reclaimed rubber and general purpose thermoplastics. In accordance with this idea, the focus of this research is to prepare DR and polypropylene (PP) based TPVs. DR is unique as the rubber itself consists of two phases- one phase consisting of uncrosslinked (including devulcanized rubber molecules), and the other phase consisting of crosslinked (un-devulcanized) rubber. These un-devulcanized crumbs act as stress concentrators because they do not break-up easily, and lead to poor physical properties. Hence, this project tries to find out ways to increase the interfacial adhesion between the rubber and PP by using reactive and non-reactive techniques. Preliminary experiments were carried out in a batch mixer to compare DR and rubber crumb (CR). DR based TPVs showed better properties than CR based TPVs, however, the properties were not useful for commercial applications. Sulphur based dynamic vulcanization was studied in a batch mixer and found to be not effective in improving the properties of DR based blends. On the other hand, DCP/ sulphur based curing system was found to show significant improvement in properties. Therefore, DCP/sulphur based curing package was studied in detail on the blends consisting of DR and PP. The optimum ratio of DCP/sulphur was found to vary depending on the ratio of DR/PP. A hypothesis regarding the mechanism of DCP/sulphur curing has been proposed, which seem to correlate well with the experimental results observed. Additionally, it was determined that DR prepared from tire rubber (DRT) performed better than DR prepared from waste EPDM (DRE) for the curing system used. Accordingly, experiments on a TSE were carried out using DRT and a combination of compatibilizing resins and…

Subjects/Keywords: Thermoplastic vulcanizates; polypropylene; twin screw extruder; compatibilizers

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APA (6^th Edition):

Mutyala, P. (2013). Preparation of Thermoplastic Vulcanizates from Devulcanized Rubber and Polypropylene. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/7420

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mutyala, Prashant. “Preparation of Thermoplastic Vulcanizates from Devulcanized Rubber and Polypropylene.” 2013. Thesis, University of Waterloo. Accessed February 27, 2021. http://hdl.handle.net/10012/7420.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mutyala, Prashant. “Preparation of Thermoplastic Vulcanizates from Devulcanized Rubber and Polypropylene.” 2013. Web. 27 Feb 2021.

Vancouver:

Mutyala P. Preparation of Thermoplastic Vulcanizates from Devulcanized Rubber and Polypropylene. [Internet] [Thesis]. University of Waterloo; 2013. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10012/7420.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mutyala P. Preparation of Thermoplastic Vulcanizates from Devulcanized Rubber and Polypropylene. [Thesis]. University of Waterloo; 2013. Available from: http://hdl.handle.net/10012/7420

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

North Carolina State University

23. Paul, Shreya. Surface Modification of Polypropylene Nonwovens to Improve Adhesion to Elastomers.

Degree: PhD, Fiber and Polymer Science, 2009, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/5165

► This study addresses how one can use blending, grafting and UV radiation techniques to make polar or hydrophilic polypropylene (PP) to overcome the shortcomings of… (more)

Subjects/Keywords: elastomers; adhesion; nonwovens; polypropylene; surface modification

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APA (6^th Edition):

Paul, S. (2009). Surface Modification of Polypropylene Nonwovens to Improve Adhesion to Elastomers. (Doctoral Dissertation). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/5165

Chicago Manual of Style (16^th Edition):

Paul, Shreya. “Surface Modification of Polypropylene Nonwovens to Improve Adhesion to Elastomers.” 2009. Doctoral Dissertation, North Carolina State University. Accessed February 27, 2021. http://www.lib.ncsu.edu/resolver/1840.16/5165.

MLA Handbook (7^th Edition):

Paul, Shreya. “Surface Modification of Polypropylene Nonwovens to Improve Adhesion to Elastomers.” 2009. Web. 27 Feb 2021.

Vancouver:

Paul S. Surface Modification of Polypropylene Nonwovens to Improve Adhesion to Elastomers. [Internet] [Doctoral dissertation]. North Carolina State University; 2009. [cited 2021 Feb 27]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5165.

Council of Science Editors:

Paul S. Surface Modification of Polypropylene Nonwovens to Improve Adhesion to Elastomers. [Doctoral Dissertation]. North Carolina State University; 2009. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5165

North Carolina State University

24. Zapletalova, Terezie. Mechanisms in Bicomponent Fiber Spinning During Melt Blown Process.

Degree: PhD, Fiber and Polymer Science, 2009, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/5935

► ZAPLETALOVA, TEREZIE. Mechanisms in Bicomponent Fiber Spinning During Melt Blown Process (Under the direction of Dr. Behnam Pourdeyhimi and Dr. Jan Genzer) A series of… (more)

Subjects/Keywords: polypropylene; polyethylene; melt blown; bicomponent fiber; nonwoven

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APA (6^th Edition):

Zapletalova, T. (2009). Mechanisms in Bicomponent Fiber Spinning During Melt Blown Process. (Doctoral Dissertation). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/5935

Chicago Manual of Style (16^th Edition):

Zapletalova, Terezie. “Mechanisms in Bicomponent Fiber Spinning During Melt Blown Process.” 2009. Doctoral Dissertation, North Carolina State University. Accessed February 27, 2021. http://www.lib.ncsu.edu/resolver/1840.16/5935.

MLA Handbook (7^th Edition):

Zapletalova, Terezie. “Mechanisms in Bicomponent Fiber Spinning During Melt Blown Process.” 2009. Web. 27 Feb 2021.

Vancouver:

Zapletalova T. Mechanisms in Bicomponent Fiber Spinning During Melt Blown Process. [Internet] [Doctoral dissertation]. North Carolina State University; 2009. [cited 2021 Feb 27]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5935.

Council of Science Editors:

Zapletalova T. Mechanisms in Bicomponent Fiber Spinning During Melt Blown Process. [Doctoral Dissertation]. North Carolina State University; 2009. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5935

University of KwaZulu-Natal

25. Sewlala, Irshaan. Wetting and separation efficiency of polypropylene packing modified by nanoparticles.

Degree: 2018, University of KwaZulu-Natal

URL: https://researchspace.ukzn.ac.za/handle/10413/17792

► Packed columns are one of the main unit operations used in distillation, extraction, absorption and hydrotreating due to their ease of operation, versatility and adaptability… (more)

▼ Packed columns are one of the main unit operations used in distillation, extraction, absorption and hydrotreating due to their ease of operation, versatility and adaptability to different chemical systems. The distribution of gas and liquid over the packing material is the basis of separation. Selection of the type of packing material is a crucial step in column design as the separation efficiency of the column is dependent on the ratio of wetted area to the total available surface of packing, known as the wetting efficiency. Glass and metal packing offer superior wetting efficiency when compared to random packing fabricated from plastic. Plastic packings offer better chemical resistance in selected systems, as well as being more lightweight and cost-effective. Literature indicates that the wetting behaviour of glass, metal and polymeric substrates may be modified by applying multilayer coatings of nanoparticles. These nanoparticles are often silica based. In this work, polypropylene random packing was modified by first being treated with the Piranha solution and then being coated by silica nanoparticles that were produced via the Stober Process. The first part of this project investigates the employment of a stimulus response technique in which an inert salt tracer is injected into an inlet liquid stream, pumped by a peristaltic pump, and allowed to flow over the packing material. The packing material being investigated in this study are glass, unmodified and modified polypropylene Raschig rings. The residence time distribution, reported as the mean residence time (MRT), and exit age distribution were determined for the three types of packing used in this study. By comparison to standard distribution curves obtained from the literature, the experimental exit age distribution curves were used to estimate the wetting efficiency of the different packing. The glass and unmodified packing had a MRT of 12 seconds while the modified packing was 19 seconds. The wetting efficiencies were 0.3, 0.4 and 0.8 respectively. The increase in MRT indicates that fluid elements resided in the column packed with modified polypropylene for a longer period while the increase in wetting efficiency shows clear improvement in wettability for the modified packing. For the second part of the study the absorption performance of the different packings was investigated. A system of water and carbon dioxide was selected to be used in the study as it is a very simple, non-toxic system and performance can be analysed using the titration method. For the 280 mm and 90 mm packed height with a 16 % carbon dioxide inlet concentration, modified packing showed improvements on absorption for all liquid flowrates for up to 10.24 % and 9.36% respectively when compared to the unmodified packing. The silica nanoparticle modification to the polypropylene packing was successful as overall, it performed better than the unmodified packing in absorption performance Advisors/Committee Members: Lokhat, David. (advisor).

Subjects/Keywords: Wetting.; Seperation efficiency.; Nanoparticles.; Polypropylene packing.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sewlala, I. (2018). Wetting and separation efficiency of polypropylene packing modified by nanoparticles. (Thesis). University of KwaZulu-Natal. Retrieved from https://researchspace.ukzn.ac.za/handle/10413/17792

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sewlala, Irshaan. “Wetting and separation efficiency of polypropylene packing modified by nanoparticles.” 2018. Thesis, University of KwaZulu-Natal. Accessed February 27, 2021. https://researchspace.ukzn.ac.za/handle/10413/17792.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sewlala, Irshaan. “Wetting and separation efficiency of polypropylene packing modified by nanoparticles.” 2018. Web. 27 Feb 2021.

Vancouver:

Sewlala I. Wetting and separation efficiency of polypropylene packing modified by nanoparticles. [Internet] [Thesis]. University of KwaZulu-Natal; 2018. [cited 2021 Feb 27]. Available from: https://researchspace.ukzn.ac.za/handle/10413/17792.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sewlala I. Wetting and separation efficiency of polypropylene packing modified by nanoparticles. [Thesis]. University of KwaZulu-Natal; 2018. Available from: https://researchspace.ukzn.ac.za/handle/10413/17792

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Toronto

26. Majithiya, Kamleshkumar M. The Effect of Molecular Weight on Polypropylene Foaming.

Degree: 2012, University of Toronto

URL: http://hdl.handle.net/1807/32605

►

The effect of molecular weight on polypropylene (PP) extrusion foaming was investigated and the process to make soft touch, largely expanded, high cell density non-crosslinked… (more)

Subjects/Keywords: Polypropylene Foaming; Extrusion; Crystallization; Non-crosslinked; 0548

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APA (6^th Edition):

Majithiya, K. M. (2012). The Effect of Molecular Weight on Polypropylene Foaming. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/32605

Chicago Manual of Style (16^th Edition):

Majithiya, Kamleshkumar M. “The Effect of Molecular Weight on Polypropylene Foaming.” 2012. Masters Thesis, University of Toronto. Accessed February 27, 2021. http://hdl.handle.net/1807/32605.

MLA Handbook (7^th Edition):

Majithiya, Kamleshkumar M. “The Effect of Molecular Weight on Polypropylene Foaming.” 2012. Web. 27 Feb 2021.

Vancouver:

Majithiya KM. The Effect of Molecular Weight on Polypropylene Foaming. [Internet] [Masters thesis]. University of Toronto; 2012. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1807/32605.

Council of Science Editors:

Majithiya KM. The Effect of Molecular Weight on Polypropylene Foaming. [Masters Thesis]. University of Toronto; 2012. Available from: http://hdl.handle.net/1807/32605

Université Catholique de Louvain

27. Drooghaag, Xavier. Reactive processing of polyolefins : a study on polymers and model compounds.

Degree: 2012, Université Catholique de Louvain

URL: http://hdl.handle.net/2078.1/118668

►

This dissertation discloses how N-bromosuccinimide mediates the grafting of maleic anhydride onto isotactic polypropylene, providing highly-grafted stereoblock polypropylene elastomers with preserved molecular weights. The grafts… (more)

Subjects/Keywords: Polypropylene; Maleic anhydride; Grafting; Model compound

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APA (6^th Edition):

Drooghaag, X. (2012). Reactive processing of polyolefins : a study on polymers and model compounds. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/118668

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Drooghaag, Xavier. “Reactive processing of polyolefins : a study on polymers and model compounds.” 2012. Thesis, Université Catholique de Louvain. Accessed February 27, 2021. http://hdl.handle.net/2078.1/118668.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Drooghaag, Xavier. “Reactive processing of polyolefins : a study on polymers and model compounds.” 2012. Web. 27 Feb 2021.

Vancouver:

Drooghaag X. Reactive processing of polyolefins : a study on polymers and model compounds. [Internet] [Thesis]. Université Catholique de Louvain; 2012. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2078.1/118668.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Drooghaag X. Reactive processing of polyolefins : a study on polymers and model compounds. [Thesis]. Université Catholique de Louvain; 2012. Available from: http://hdl.handle.net/2078.1/118668

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Hong Kong University of Science and Technology

28. Tang, Eunice Wai Chong. Preparation and characterization of polypropylene-polypropylene (PP-PP) composites.

Degree: 2003, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-5248 ; https://doi.org/10.14711/thesis-b786509 ; http://repository.ust.hk/ir/bitstream/1783.1-5248/1/th_redirect.html

► Composites consisting of the same thermoplastic material for the matrix phase and reinforcement, the so-called ‘polymer unity composites’, are gaining increasing attention. These composites, typically… (more)

▼ Composites consisting of the same thermoplastic material for the matrix phase and reinforcement, the so-called ‘polymer unity composites’, are gaining increasing attention. These composites, typically those made from polypropylene (PP) and/or polyethylene (PE), possess distinct properties with potential unique applications. Unlike the conventional composites containing glass or carbon fibers embedded in polymer matrices, they can be easily recycled as they do not require the tedious process to separate the reinforcement fibers from the matrix before individual recycling. These composites can be called the ‘green composites’ as they are more environment-friendly than other coniposite materials in terms of ease of recycling. In the present study, the effects of various processing conditions, including different cooling rates and isothermal cooling, on the morphology and important mechanical properties of PP/PP composites consisting of homo-PP fibers and propylene-ethylene random copolymer matrix were characterized. The effect of service temperature was also evaluated. The interfacial adhesion was correlated to the degree of crystallinity, crystalline morphology and the bulk mechanical properties of the composite. Composite laminates of different cooling rates and thermal treatments were prepared using filming stacking and compression molding methods. The single filament fragmentation test was carried out to characterize the PP fibre-PP matrix interfacial adhesion. It is shown that the slow cooled samples had a higher interfacial shear strength (IFSS) than the fast cooled ones. It is shown that the tensile properties generally increased with decreasing cooling rate. The isothermal treatment also improved the tensile strength and modulus as the slow cooling rate did. This can be attributed to the change in the crystallinity induced by different thermal processes. A higher crystallinity in the slow cooled samples gives rise to a high tensile strength and modulus and a relative brittle fracture mechanism, whereas a lower crystallinity introduced by the fast cooling process results in a relatively high ductility with lower tensile properties. There were functionally similar variations in IFSS and tensile properties with respect to cooling rate. The Charpy impact test results indicate that the impact performance of the composites is highly dependent on the testing temperature. There was virtually no difference in impact fracture energy between the samples processed at different cooling rates when tested at room temperature. The sensitivity of cooling rate on impact fracture energy became significant when tested at sub-zero temperatures. The impact fracture energy were generally higher for the samples with slower cooling rates than the fast cooled samples.

Subjects/Keywords: Polypropylene ; Composite materials

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APA (6^th Edition):

Tang, E. W. C. (2003). Preparation and characterization of polypropylene-polypropylene (PP-PP) composites. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-5248 ; https://doi.org/10.14711/thesis-b786509 ; http://repository.ust.hk/ir/bitstream/1783.1-5248/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tang, Eunice Wai Chong. “Preparation and characterization of polypropylene-polypropylene (PP-PP) composites.” 2003. Thesis, Hong Kong University of Science and Technology. Accessed February 27, 2021. http://repository.ust.hk/ir/Record/1783.1-5248 ; https://doi.org/10.14711/thesis-b786509 ; http://repository.ust.hk/ir/bitstream/1783.1-5248/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tang, Eunice Wai Chong. “Preparation and characterization of polypropylene-polypropylene (PP-PP) composites.” 2003. Web. 27 Feb 2021.

Vancouver:

Tang EWC. Preparation and characterization of polypropylene-polypropylene (PP-PP) composites. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2003. [cited 2021 Feb 27]. Available from: http://repository.ust.hk/ir/Record/1783.1-5248 ; https://doi.org/10.14711/thesis-b786509 ; http://repository.ust.hk/ir/bitstream/1783.1-5248/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tang EWC. Preparation and characterization of polypropylene-polypropylene (PP-PP) composites. [Thesis]. Hong Kong University of Science and Technology; 2003. Available from: http://repository.ust.hk/ir/Record/1783.1-5248 ; https://doi.org/10.14711/thesis-b786509 ; http://repository.ust.hk/ir/bitstream/1783.1-5248/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Hong Kong University of Science and Technology

29. Wang, Wei. Effect of matrix/particle interface on mechanical properties of polypropylene nanocomposites.

Degree: 2017, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-90933 ; https://doi.org/10.14711/thesis-991012558769703412 ; http://repository.ust.hk/ir/bitstream/1783.1-90933/1/th_redirect.html

► The effect of the matrix/particle interface on the mechanical properties of polypropylene (PP) nanocomposites is studied. In the present study, grafting silica nanoparticles with polypropylene… (more)

▼ The effect of the matrix/particle interface on the mechanical properties of polypropylene (PP) nanocomposites is studied. In the present study, grafting silica nanoparticles with polypropylene chains (PP-grafted silica, PGS) is proven to be a promising strategy to strengthen or weaken the interfacial binding between PP matrix and PGS. The extents of strengthening or weakening effect are correlated to the grafting chain length of PGS. When the molecular weight of a graft is above the critical molecular weight (M_c) of PP, the T_g of the PP/PGS nanocomposite shows higher than the neat PP, indicating a strong interfacial interaction, and vice versa. Entanglement interaction between the grafting chain and the matrix is considered to be the key parameter governing interfacial strength. The change in the matrix/particle interfacial strength leads to a transition in the yield stress of nanocomposites. Compared with the unfilled PP, the yield stress of the PP/PGS nanocomposites is decreased in the case of unfavorable interaction and can be enhanced in the case of a strong interaction. In addition, benefiting from good dispersion, the PP/PGS nanocomposites with a strong matrix/particle interface not only exhibit increased Young’s modulus and yield stress, but also the strain at break remains in line with the unfilled PP, which is in contrast to the conventional wisdom that the gain in modulus and strength must be at the expense of the lower break strain. Due to the weak matrix/filler interface, the great improvement in impact toughness of PP filled with stearic acid modified CaCO₃ (SA-CaCO₃) nanoparticles has been reported. In the present study, the ligament strength relating to entanglement density was proven to be one of factors to influence the toughening effect by comparing the impact strength of the PP/SA-CaCO₃ nanocomposites before and after annealing. Considering PGS can be applied to strengthen the PP ligament, a ternary nanocomposite (PP/PGS/SA-CaCO₃) with multiple matrix/particle interfaces was prepared and studied. Young’s modulus and yield stress of the ternary nanocomposites performs as expected. However, the impact strength is comparable to that of neat PP. The toughening effect of SA-CaCO₃ in the PP/ SA-CaCO₃ system is ineffective in the ternary nanocomposites, which is attributed to the following fact: Because the attraction between PGS and SA-CaCO₃ is higher than that between the PP matrix and inorganic particles, the aggregates of two different particles form, where the weak interface of CaCO₃ acts as a sharp crack, leading to an insignificant change of impact resistance.

Subjects/Keywords: Polypropylene ; Nanocomposites (Materials) ; Polymeric composites ; Mechanical properties

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang, W. (2017). Effect of matrix/particle interface on mechanical properties of polypropylene nanocomposites. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-90933 ; https://doi.org/10.14711/thesis-991012558769703412 ; http://repository.ust.hk/ir/bitstream/1783.1-90933/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wang, Wei. “Effect of matrix/particle interface on mechanical properties of polypropylene nanocomposites.” 2017. Thesis, Hong Kong University of Science and Technology. Accessed February 27, 2021. http://repository.ust.hk/ir/Record/1783.1-90933 ; https://doi.org/10.14711/thesis-991012558769703412 ; http://repository.ust.hk/ir/bitstream/1783.1-90933/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wang, Wei. “Effect of matrix/particle interface on mechanical properties of polypropylene nanocomposites.” 2017. Web. 27 Feb 2021.

Vancouver:

Wang W. Effect of matrix/particle interface on mechanical properties of polypropylene nanocomposites. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2017. [cited 2021 Feb 27]. Available from: http://repository.ust.hk/ir/Record/1783.1-90933 ; https://doi.org/10.14711/thesis-991012558769703412 ; http://repository.ust.hk/ir/bitstream/1783.1-90933/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang W. Effect of matrix/particle interface on mechanical properties of polypropylene nanocomposites. [Thesis]. Hong Kong University of Science and Technology; 2017. Available from: http://repository.ust.hk/ir/Record/1783.1-90933 ; https://doi.org/10.14711/thesis-991012558769703412 ; http://repository.ust.hk/ir/bitstream/1783.1-90933/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Hong Kong University of Science and Technology

30. Zhang, Yiqing. Study on the synergistic effect and toughening mechanisms of PP/CaCO₃ nano-composites modified with glycidyl methacrylate grafted EPR.

Degree: 2017, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-90948 ; https://doi.org/10.14711/thesis-991012555458403412 ; http://repository.ust.hk/ir/bitstream/1783.1-90948/1/th_redirect.html

► Polypropylene (PP) is one of the most commonly used synthetic resins. PP has a very good overall performance so that it is widely used in… (more)

▼ Polypropylene (PP) is one of the most commonly used synthetic resins. PP has a very good overall performance so that it is widely used in all aspects of the national economy. But there are also some obvious defects that limit the use of polypropylene in certain areas. Therefore, in order to overcome the shortcomings of performance, as well as improve its application, many researchers have focused on the investigation of polypropylene. In the present paper, in order to cope with the lack of toughness (that is one of the most important drawbacks of polypropylene) and poor rigid-tough balance in modification for PP, these problems are studied and discussed in detail. Firstly, the effect of nano-CaCO₃ on the mechanical properties of PP was also studied. It was found that nano-CaCO₃ had a better toughening effect on PP. When the content of nano-CaCO₃ were 35wt% and 30wt%, the impact strength attained the maximum value at room temperature (23℃) and low temperature (-20℃) respectively. When the content of nano-CaCO₃ was over a certain value, the impact strength drops dramatically due to the nanoparticles get into agglomeration. Meanwhile, the effects of the SPF179-g-GMA addition on the mechanical properties of PP and toughening effect of EPR on PP matrix were also investigated. In this paper, the PP/nano-CaCO₃/grafted impact co-PP (SPF179-g-GMA) system was studied and characterized in detail. Through the test of the mechanical properties, thermal properties, dimensional stability and processing properties of PP/nano-CaCO₃/grafted impact co-PP, the effect of each component on the various properties of the composites and microstructure were studied. It was found that the presence of ethylene-propylene rubber with polar functional groups in the three-phase system containing 40wt% calcium carbonate showed that the calcium carbonate did not appear as a dry powder agglomeration state in the two phases, but a large part entered the EPR to form a rubber nanoparticle composite ball. The microstructures of binary blends and ternary composites were characterized by SEM, TEM and AFM. And the relationship between the microstructure of the material and the change of the impact strength is studied in depth. The synergistic effects of PP/nano-CaCO₃/ grafted impact co-PP three-phase composite system at room temperature (23℃) and low temperature (-20℃) were successfully explained by energy absorption mechanism. The effects of temperature and particle concentration on the molecular chain motion of rubber were studied. The different phenomena of the three-phase system under room temperature and low temperature were explained and confirmed by DMA characterization. Through the study, under the guidance of the mechanism, a comprehensive performance of a good formula is obtained: composite material contains 30wt%PP, 30wt%nano-CaCO₃, 40wt% grafted impact co-PP. Compared with pure PP, the impact strength of composited increased by nearly 6 times, but the modulus…

Subjects/Keywords: Polypropylene ; Mechanical properties ; Nanocomposites (Materials) ; Calcium carbonate

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, Y. (2017). Study on the synergistic effect and toughening mechanisms of PP/CaCO₃ nano-composites modified with glycidyl methacrylate grafted EPR. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-90948 ; https://doi.org/10.14711/thesis-991012555458403412 ; http://repository.ust.hk/ir/bitstream/1783.1-90948/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhang, Yiqing. “Study on the synergistic effect and toughening mechanisms of PP/CaCO₃ nano-composites modified with glycidyl methacrylate grafted EPR.” 2017. Thesis, Hong Kong University of Science and Technology. Accessed February 27, 2021. http://repository.ust.hk/ir/Record/1783.1-90948 ; https://doi.org/10.14711/thesis-991012555458403412 ; http://repository.ust.hk/ir/bitstream/1783.1-90948/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhang, Yiqing. “Study on the synergistic effect and toughening mechanisms of PP/CaCO₃ nano-composites modified with glycidyl methacrylate grafted EPR.” 2017. Web. 27 Feb 2021.

Vancouver:

Zhang Y. Study on the synergistic effect and toughening mechanisms of PP/CaCO₃ nano-composites modified with glycidyl methacrylate grafted EPR. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2017. [cited 2021 Feb 27]. Available from: http://repository.ust.hk/ir/Record/1783.1-90948 ; https://doi.org/10.14711/thesis-991012555458403412 ; http://repository.ust.hk/ir/bitstream/1783.1-90948/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhang Y. Study on the synergistic effect and toughening mechanisms of PP/CaCO₃ nano-composites modified with glycidyl methacrylate grafted EPR. [Thesis]. Hong Kong University of Science and Technology; 2017. Available from: http://repository.ust.hk/ir/Record/1783.1-90948 ; https://doi.org/10.14711/thesis-991012555458403412 ; http://repository.ust.hk/ir/bitstream/1783.1-90948/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Open Access Theses and Dissertations