Análise dos métodos de precipitação e precipitação em emulsão na produção de masterbatch, para posterior obtenção de nanocompósitos de PA6/GNP.

Abstract

The objective of this work was to develop polyamide 6 (PA6) masterbatches with different contents of graphene nanoplatelets (GNP), using the solution mixing technique and employing two different precipitation routes during the solvent removal step, the conventional precipitation and emulsion precipitation. The obtained masterbatches were diluted at 5% by weight in PA6 and used to produce PA6/GNP nanocomposites by melt mixing. The produced materials were characterized through mechanical, thermal, rheological, and morphological tests. The results revealed improvements in the mechanical properties of the PA6/GNP nanocomposites, specifically in tensile strength, flexural strength, and modulus of elasticity, with improvements up to 26.8%, 19%, and 30.3%, respectively. In dynamic mechanical analysis (DMA), most of the graphene samples showed a significant improvement in the storage modulus at 23°C and 100°C, they also showed increased values of heat deflection temperature (HDT). In summary, the results highlighted that the addition of graphene nanoplatelets and the choice of precipitation route are relevant to the properties of the studied nanocomposites. The precipitation route proved to be more attractive for improvements in mechanical and thermal properties, while the emulsion route offered rheological and thermal advantages. Therefore, the PA6/GNP nanocomposites have potential for applications requiring greater stiffness and tensile strength, as well as for high-temperature applications. [resumo fornecido pelo autor]