Propriedades de barreira, mecânicas e térmicas de blendas de biopoliamidas (610/1010) e seus nanocompósitos

Abstract

The use of aluminum silicate-based reinforcements has become an alternative for improving the mechanical, thermal and barrier properties of polymeric materials. In this sense, organomodified montmorillonite clay stands out among reinforcement materials for providing, even in small amounts, significant improvements in nonpolar polymers such as polyamides. Thus, the present study aimed to evaluate the influence of a nanofiller (Cloisite 30B) at levels of 3, 5 and 8% on the mechanical, thermal and barrier properties of biorenewable polyamides (PA 6.10 and PA 10.10). For this, samples were produced by the extrusion and injection method, which included pure polyamides and their blend, as well as these with the addition of clay in different concentrations. The characterization of these samples was initially carried out by XRD, SEM and EDS, in which it was possible to evaluate the degree of clay dispersion in the matrix of polyamides and the blend. The results pointed to the difficulty of dispersing the clay at higher concentrations, showing the presence of agglomerates in the composition with 8% clay. Subsequently, thermal analyzes were carried out by DSC and mechanical analyzes by tensile testing, which together with the gasoline permeability test, showed a strong influence of clay with 3% clay content, whose dispersion was more favored.