O objetivo deste trabalho foi avaliar o efeito do compatibilizante PE-g-MA (5 e 10%) no comportamento reológico de nanocompósitos de poliamida6/polietileno/argila organofílica, onde a argila foi tratada com um sal quaternário de amônio (Cetremide). Em geral, observou-se que a presença do compatibilizante aumentou o torque da mistura de PA6/PE e que a presença da argila organofílica (2%) sem o compatibilizante não pareceu alterar o comportamento do torque da mistura. Por outro lado, para o nanocompósito com 10% em peso de compatibilizante e com a argila organofílica, verificou-se um aumento significativo do torque em relação às outras misturas, evidenciando maior interação da argila organofílica com as matrizes poliméricas, isto é, maior viscosidade do sistema, promovida provavelmente pela presença do compatibilizante. Os resultados de difração de raio X mostraram que os sistemas apresentaram estrutura intercalada e/ou esfoliada.

The aim of this work was to evaluate the effect of PE-g-MA (5 and 10 wt.%) compatibilizer on the rheological behavior of polyamide6/polyethylene/organoclay nanocomposites. The organoclay was treated with a quaternary ammonium salt (Cetremide). In general, it was observed that the presence of compatibilizer increased the torque of PA6/PE blend and that the presence of organoclay (2 wt.%) did not appear to affect the torque behavior of the blend without compatibilizer. On the other hand, for the nanocomposite with 10 wt.% of compatibilizer and with the organoclay, a significant increase in torque was observed in comparison with other mixtures, thus pointing to strong interaction between the caly and the polymer matrices, i.e. a larger viscosity of the system, probably due to the presence of compatibilizer. The results from X ray diffraction showed that the systems presented intercalated and/or exfoliated structure.

The mechanical properties of polyester/fiberglass composites were studied. The aim of this work was to evaluate the possibility of reusing the wastes taken from spray-up processing of Paraíba state Industries as reinforcement in polyester matrix composites. Composites with 20, 30, 40, 50 and 60 wt. (%) of recycled fiberglass were prepared by compression molding and compared with polyester/ virgin glass fiber composites. The mechanical properties and water sorption behavior were evaluated. The results showed that fiberglass wastes are promising to be reused in polyester resin composites. The impact strength was excellent. It can be concluded that the reusing of the fiberglass wastes is viable.

Nanocompósitos de polietileno de alta densidade e poliamida-6 com argila bentonita nacional foram preparados por meio do processo de intercalação por fusão. Para a modificação da argila foram utilizados tipos diferentes de sais quaternários de amônio visando sintetizar as argilas organofílicas. As argilas não modificada e modificada com os sais foram incorporadas nas matrizes poliméricas, sendo que foram utilizados procedimentos diferentes para a modificação das argilas: para os nanocompósitos de polietileno, a argila foi preparada com quatro sais quaternários de amônio e para os nanocompósitos de poliamida-6 foi utilizado um único tipo de sal quaternário de amônio, variando-se seus teores para a organofilização da argila. O objetivo desse trabalho foi obter nanocompósitos de polietileno e poliamida-6 e caracterizá-los por microscopia eletrônica de transmissão (MET) e por difração de raios X (DRX). Os resultados indicaram que os sistemas polietileno/argila organofílica apresentaram estruturas de nanocompósitos intercalados e/ou parcialmente esfoliados. Já os sistemas poliamida-6/argila organofílica apresentaram uma morfologia esfoliada com uma predominância de partículas de argilas dispersas na matriz.

High density polyethylene and nylon 6 nanocomposites with national bentonite clay were prepared with the melt intercalation technique. Different quaternary ammonium salts were used to obtain the organoclays. The unmodified and modified clays with the salts were incorporated in the polymer matrices and different procedures were used for the modification of clays: for the polyethylene nanocomposites, the clay was prepared with four quaternary ammonium salts and for the nylon 6 nanocomposites only one type of quaternary ammonium salt was used, which had its contents varied in the organophilization of the clay. The objective of this work was to obtain polyethylene and nylon 6 nanocomposites. They were characterized by transmission electron microscopy (TEM) and by X-ray diffraction (XRD). The results indicated that the polyethylene/organoclay systems presented structures of intercalated nanocomposites and/or partially exfoliated. The nylon 6/organoclay systems presented an exfoliated morphology with clay particles dispersed in the matrix.