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Master's Dissertation
DOI
10.11606/D.3.2014.tde-19032015-154341
Document
Author
Full name
Aurianny Pereira Lima
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2014
Supervisor
Committee
Hui, Wang Shu (President)
Carastan, Danilo Justino
Drumond, Walker Soares
Title in Portuguese
Estudo da fase cristalina beta em compósitos de polipropileno.
Keywords in Portuguese
Materiais compósitos poliméricos
Abstract in Portuguese
O presente trabalho busca o entendimento do aparecimento da fase cristalina em compósitos de polipropileno isotático, que contém carbonato de cálcio, em presença ou não de polipropileno modificado com anidrido maléico (PPMA). Vários tipos de CaCO3 foram utilizados: com diâmetros médios de 0,9 m, com e sem tratamento superficial, 2,5 m e 3,0 m. As duas séries de compósitos, com e sem PPMA, denominadas iPP/CaCO3/PPMA e iPP/CaCO3, foram formuladas com as seguintes razões mássicas, 94,5/5/0,5% e 95/5, respectivamente. Em ambas as séries, observou-se a ocorrência das fases cristalinas e do polipropileno; entretanto, a concentração relativa variou de acordo com o tipo de compósito. A caracterização das fases cristalinas presentes nos compósitos foi realizada utilizando a difratometria de raio-x (DRX) e análises térmicas, principalmente, calorimetria diferencial exploratória (DSC). As análises por DSC incluíram o estudo cinético da cristalização isotérmica e não isotérmica dos compósitos. Os resultados obtidos permitiram identificar os compósitos com maior concentração de fase cristalina e relacionar a sua formação com os constituintes presentes nos compósitos.
Title in English
Study of beta crystalline phase in polypropylene composites.
Keywords in English
Composite materials polymeric
Abstract in English
The present work aims to understand the occurrence of the beta crystalline phase in composites of isotactic polypropylene with calcium carbonate in the presence or not of polypropylene grafted maleic anhydride (PPMA). CaCO3 having different average diameter were used: 0.9 m with and without surface treatment, 2.5 m and 3.0 m. Both series of composites, one with PPMA and another without, named iPP/CaCO3/PPMA and iPP/CaCO3, were formulated at the following mass proportions: 94.5/5/0.5% and 95/5, respectively. The presence of the e crystalline phases in polypropylene were observed. However, the relative concentration of such phases depended on the composite composition. The characterization of the crystalline phases in composites were performed by using x-ray diffraction (DRX) and thermal analyses, mainly, differential scanning calorimetry (DSC). DSC analysis was used to investigate isothermal crystallization kinetic and nonisothermal crystallization kinetic. The results allowed the identification of the composites with higher concentration of crystalline phase and it was possible to attribute the phase occurrence to the presence of specific constituents of the composites.
 
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Publishing Date
2015-03-24
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • LIMA, A. P., SAKAHARA, R. M., e Wang, Shu Hui. Análise da ocorrência de fase cristalina beta em compósitos de polipropileno isotático, carbonato de cálcio com e sem polipropileno modificado com anidrido maléico. In 12º Congresso Brasileiro de Polímeros, Florianópolis, 2013. Anais do 12º Congresso Brasileiro de Polímeros.São Carlos : ABPOL, 2013.
  • WANG, S. H., et al. Fluoração por plasma da superfície de filmes de poliuretano para aplicações médicas. In 6ºCBPOL - IX International Macromolecular Colloquium, Gramado. nais do 6ºCBPOL - IX International Macromolecular Colloquium.Sao Carlos : ABPOL, 2001.
All rights of the thesis/dissertation are from the authors
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