Síntese de argilas organofílicas para uso na preparação de nanocompósitos a base de poli(tereftalato de etileno).

Abstract

This study was conducted in order to improve the technique to obtain organoclays. Therefore, factors not yet well understood in regard to organoclays were evaluated and elucidated in this work. Thus, a predominantly sodium bentonite, from Bentonit União Nordeste-Campina Grande/PB, was purified to remove organic contaminants with the purpose of improving the process of intercalation with organic surfactants. The natural and purified bentonites were modified with cetyl trimethyl ammonium bromide (C) and modified hexadecyl tributyl fosfônio bromide (CF) using different conditions of preparation (time, type and content of surfactant). To compare the results obtained in this study with those reported in the literature, a commercial sodium montmorillonite, Closite Na+, supplied by Southern Clay Products-Texas/EUA was also used. The organoclays obtained were incorporated into PET by melt process. The prepared samples were characterized by infrared spectroscopy (FTIR), X-ray diffraction (XRD) and thermogravimetric analysis (TG). Is evidenced according to results that the purification treatment, the type of surfactant and the conditions of preparation of the organophilic clay influenced the morphology and characteristics of the clays and the nanocomposites prepared.