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You searched for subject:( pt REPROCESSAMENTO). One record found.

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Pontifical Catholic University of Rio de Janeiro

1. WILLIAM BUSCHLE ROMARIZ INACIO. [en] EFFECT OF REPROCESSING ON THE MECHANICAL PROPERTIES OF A HDPE/LDPE BLEND.

Degree: 2018, Pontifical Catholic University of Rio de Janeiro

[pt] Os termoplásticos representam a grande maioria dos polímeros empregados hoje em dia e a grande vantagem de sua aplicação é que podem ser reaquecidos e moldados repetidamente. Com a crise do petróleo em 1973, os custos para transformar o petróleo em materiais plásticos se tornaram mais atrativos do que transformá-lo em materiais mais tradicionais. Com isso, os investimentos nas indústrias de transformação cresceram, ao mesmo tempo que a preocupação com o meio ambiente. Devido a facilidade de reprocessar esses materiais a temperaturas moderadas, muitas empresas passaram a reutilizar seus resíduos dentro de seus próprios processos. Neste escopo, esse trabalho tem como objetivo estudar o comportamento mecânico do polietileno de baixa densidade (PEBD) e de uma mistura física formada por polietileno de baixa densidade (PEAD) e polietileno de alta densidade, com uma proporção de 80/20, ao serem submetidos a diversos ciclos de processamento. Os materiais estudados foram preparados e doados pela Companhia de Canetas Compactor. Para este estudo, o material sofreu dez etapas de injeção/extrusão. A partir de ensaios de tração foram determinadas as tensões e cargas máximas suportadas, calculando-se em seguida o módulo de elasticidade, alongamento e tenacidade de cada material. A adição do PEAD é responsável por aumentar a resistência e a dureza do material. Do ponto de vista prático, o material reprocessado não apresentou mudanças significativas de performance. Análises por infravermelho mostraram que não há degradação por oxidação ao longo do processo de reciclagem.

[en] Thermoplastics are the most used polymers nowadays on account of being easily reprocessable with high temperatures. During the oil crisis in 1973 the costs of transforming oil into plastic materials became more attractive than turning them into more traditional materials. Furthermore, the investments in transformation industries grew alongside the concern for the environment. Due to the ease of reprocessing these materials a lot of companies started recycling them within their process. In this context, the present study aims to analyze the mechanical behavior of a low density polyethylene (LDPE) and high density polyethylene (HDPE) blend and pure LDPE after 10 cycles of reprocessing. The polymers were donated by Companhia de Canetas Compactor. The materials suffered up to 10 cycles of injection moulding/extrusion. Tensile tests were made to determine the maximum yield stress and maximum load allowed. Afterwards, calculations were made to determine elongation, Young modulus and toughness. The HDPE addition was responsible to raise the materials yield stress and hardness. From a practical point of view the reprocessing didn t affect significantly the materials performance. FTIR analyses didn t detect oxidation through the process.

Advisors/Committee Members: JOSE ROBERTO MORAES D ALMEIDA.

Subjects/Keywords: [pt] CICLOS; [en] CYCLES; [pt] RECICLAGEM; [en] RECYCLING; [pt] TENACIDADE; [en] TOUGHNESS; [pt] INJECAO; [en] INJECTION; [pt] PEAD; [en] HDPE; [pt] COMPORTAMENTO MECANICO; [en] MECHANICAL BEHAVIOR; [pt] TERMOPLASTICOS; [en] THERMOPLASTICS; [pt] POLIETILENO; [en] POLYETHYLENE; [pt] PEBD; [en] LDPE; [pt] REPROCESSAMENTO; [en] REPROCESSING

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

APA (6th Edition):

INACIO, W. B. R. (2018). [en] EFFECT OF REPROCESSING ON THE MECHANICAL PROPERTIES OF A HDPE/LDPE BLEND. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34970

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

Chicago Manual of Style (16th Edition):

INACIO, WILLIAM BUSCHLE ROMARIZ. “[en] EFFECT OF REPROCESSING ON THE MECHANICAL PROPERTIES OF A HDPE/LDPE BLEND.” 2018. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed December 05, 2019. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34970.

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

MLA Handbook (7th Edition):

INACIO, WILLIAM BUSCHLE ROMARIZ. “[en] EFFECT OF REPROCESSING ON THE MECHANICAL PROPERTIES OF A HDPE/LDPE BLEND.” 2018. Web. 05 Dec 2019.

Vancouver:

INACIO WBR. [en] EFFECT OF REPROCESSING ON THE MECHANICAL PROPERTIES OF A HDPE/LDPE BLEND. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2018. [cited 2019 Dec 05]. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34970.

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

Council of Science Editors:

INACIO WBR. [en] EFFECT OF REPROCESSING ON THE MECHANICAL PROPERTIES OF A HDPE/LDPE BLEND. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2018. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34970

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

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