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1. Sadatshirazi, S. Aromatic polyamide short fibres-reinforced elastomers: adhesion mechanisms and the composite's performance properties.

Degree: Faculty of Engineering Technology, 2012, University of Twente

The current thesis consists of a chapter as literature review in which different scientific sources and the results of investigation of various researchers are reviewed, followed by 5 chapters (2 to 6) and an appendix covering the results of the experimental work performed. The results can be divided in 3 main sections: Section 1: Short-fibre rubber composites. In the first section rubber composites reinforced with short aramid fibres are focused upon; the reinforcement mechanisms and the mechanical and viscoelastic properties of the composites are explored. • In the second chapter, short fibre reinforced NR and EPDM rubbers are the subjects of investigation. In the different short fibre-rubber systems examined, clear chemical adhesion only happened in the case of peroxide-cured EPDM with RFL-treated fibres. This phenomenon was most clearly reflected in the tensile curves for this system, showing a large reinforcement factor particularly at tensile elongations below 100%. Next to potential chemical bonding, mechanical interaction between fibres and rubber matrix plays an important role. Surface phenomena on the fibres, as bending/buckling, dog-bone shaped fibre ends and surface roughness due to the RFL-coating cause mechanical interlocking. So, even in the absence of chemical adhesion, adding short aramid fibres improves the mechanical properties of rubber compounds because of the mechanical interaction. • Chapter three describes the results of the investigation of the composite morphology and interaction of two different types of short aramid fibres in an EPDM radiator hose compound and its corresponding model system. PPTA fibres with RFL-dip could not be dispersed completely to filament level due to the gluing effect of the dip. Irrespective of the mixing time, PP/ODPTA fibres could better withstand the applied shear stresses during mixing and maintain a high level of fibre length, which resulted in better mechanical properties in composites reinforced with these fibres compared to those reinforced with PPTA fibres. On the other side, the RFL-dip acted as protective layer and prevented the fibres from excessive breaking, which was especially the case for PPTA. It was shown that for RFL-coated fibres, chemical bonding only happens between a part of RFL-treated filaments and EPDM rubber. Still the composites containing these fibres showed better mechanical properties compared to those reinforced with standard finish. The reason for this superiority is not only the partial chemical bonds, but two more factors are involved: better mechanical interlocking of the RFL-treated fibres and the surrounding matrix (due to the roughness of the coating), and the higher final length of these fibres after mixing. • Due to the importance of viscoelastic properties in performance of a lot of rubber parts, especially tires, the dynamic properties of the short fibre-reinforced compounds are the subject of the fourth chapter. It was shown that mechanical and chemical interactions between short fibres and a rubber matrix, which are the… Advisors/Committee Members: Noordermeer, Jacobus W.M., Talma, Auke, Elastomer Technology and Engineering.

Subjects/Keywords: IR-82218; METIS-289311

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APA (6th Edition):

Sadatshirazi, S. (2012). Aromatic polyamide short fibres-reinforced elastomers: adhesion mechanisms and the composite's performance properties. (Doctoral Dissertation). University of Twente. Retrieved from https://research.utwente.nl/en/publications/aromatic-polyamide-short-fibresreinforced-elastomers-adhesion-mechanisms-and-the-composites-performance-properties(0e5ac49d-29dd-4e65-b647-991554f883be).html ; urn:nbn:nl:ui:28-82218 ; 0e5ac49d-29dd-4e65-b647-991554f883be ; 10.3990/1.9789036534628 ; urn:isbn:978-90-365-3462-8 ; urn:nbn:nl:ui:28-82218 ; https://research.utwente.nl/en/publications/aromatic-polyamide-short-fibresreinforced-elastomers-adhesion-mechanisms-and-the-composites-performance-properties(0e5ac49d-29dd-4e65-b647-991554f883be).html

Chicago Manual of Style (16th Edition):

Sadatshirazi, S. “Aromatic polyamide short fibres-reinforced elastomers: adhesion mechanisms and the composite's performance properties.” 2012. Doctoral Dissertation, University of Twente. Accessed August 11, 2020. https://research.utwente.nl/en/publications/aromatic-polyamide-short-fibresreinforced-elastomers-adhesion-mechanisms-and-the-composites-performance-properties(0e5ac49d-29dd-4e65-b647-991554f883be).html ; urn:nbn:nl:ui:28-82218 ; 0e5ac49d-29dd-4e65-b647-991554f883be ; 10.3990/1.9789036534628 ; urn:isbn:978-90-365-3462-8 ; urn:nbn:nl:ui:28-82218 ; https://research.utwente.nl/en/publications/aromatic-polyamide-short-fibresreinforced-elastomers-adhesion-mechanisms-and-the-composites-performance-properties(0e5ac49d-29dd-4e65-b647-991554f883be).html.

MLA Handbook (7th Edition):

Sadatshirazi, S. “Aromatic polyamide short fibres-reinforced elastomers: adhesion mechanisms and the composite's performance properties.” 2012. Web. 11 Aug 2020.

Vancouver:

Sadatshirazi S. Aromatic polyamide short fibres-reinforced elastomers: adhesion mechanisms and the composite's performance properties. [Internet] [Doctoral dissertation]. University of Twente; 2012. [cited 2020 Aug 11]. Available from: https://research.utwente.nl/en/publications/aromatic-polyamide-short-fibresreinforced-elastomers-adhesion-mechanisms-and-the-composites-performance-properties(0e5ac49d-29dd-4e65-b647-991554f883be).html ; urn:nbn:nl:ui:28-82218 ; 0e5ac49d-29dd-4e65-b647-991554f883be ; 10.3990/1.9789036534628 ; urn:isbn:978-90-365-3462-8 ; urn:nbn:nl:ui:28-82218 ; https://research.utwente.nl/en/publications/aromatic-polyamide-short-fibresreinforced-elastomers-adhesion-mechanisms-and-the-composites-performance-properties(0e5ac49d-29dd-4e65-b647-991554f883be).html.

Council of Science Editors:

Sadatshirazi S. Aromatic polyamide short fibres-reinforced elastomers: adhesion mechanisms and the composite's performance properties. [Doctoral Dissertation]. University of Twente; 2012. Available from: https://research.utwente.nl/en/publications/aromatic-polyamide-short-fibresreinforced-elastomers-adhesion-mechanisms-and-the-composites-performance-properties(0e5ac49d-29dd-4e65-b647-991554f883be).html ; urn:nbn:nl:ui:28-82218 ; 0e5ac49d-29dd-4e65-b647-991554f883be ; 10.3990/1.9789036534628 ; urn:isbn:978-90-365-3462-8 ; urn:nbn:nl:ui:28-82218 ; https://research.utwente.nl/en/publications/aromatic-polyamide-short-fibresreinforced-elastomers-adhesion-mechanisms-and-the-composites-performance-properties(0e5ac49d-29dd-4e65-b647-991554f883be).html

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