Avaliação das propriedades físico-químicas das blendas de poliamida 6 e 66 com fibroina reforçadas com nanotubos de carbono

Abstract

Silk fibroin is a natural biopolymer from Bombyx mori, which has excellent thermal stability and high mechanical strength. Part of this biopolymer is rejected in industrial processes due to the formation of some defects in parts of the cocoons. One way to use these wastes would be to incorporate blends for the manufacture of materials for being used in engineering and thus to contribute to the reuse in the industrial process, as well as the use of 100% of waste generated, in addition to reducing consumption of non-renewable natural resources, such as oil resources Among the components for the incorporation of silk fibroin in blends systems, polyamides 6 and 66 are outstanding because they have characteristics similar to the biopolymer, in addition to their excellent mechanical and thermal stability. Another component is carbon nanotubes with high thermal and mechanical stabilities. Thus, the study aims to make films composed of fibroin, polyamides 6 and 66 and carbon nanotubes by means of dissolution in formic acid and mixing in proportions of 40:60 50:50 and 60:40% of Fibroin / Polyamide, adding carbon nanotubes at 0.000g, 0.025g, 0.050g and 0.100g. Subsequently the blends are scattered in 10mL volume each proportion in teflon plates where by casting the solvent is evaporated and the films are then dried in an oven. Subsequently, the films were submitted to the evaluation of their physicochemical properties by FTIR, Thermogravimetric analysis, mechanical traction tests and X - ray diffraction. Film evaluations showed that the presence of fibroin improved thermal stability, polyamide 66 was stable with higher silk fibroin content and modulus of elasticity reached 5,0 GPa for both polyamide 6 and polyamide 66. Carbon nanotubes aided reinforcements from 0.025g to 0.050g by mass in the compound and the thermal and mechanical results obtained prove to be good material with potential for engineering application.