Avaliação da utilização de ácidos orgânicos no tratamento de fibras de pinus com óxido de grafeno para potencial aplicação no desenvolvimento de compósitos poliméricos

Abstract

In order to improve the properties and characteristics of a reinforcing material that will undergo treatment with advanced materials and may be incorporated into a polymer composite, there must be interaction between the material and the reinforcement. This work studies the action of hexanoic (C6), octanoic (C8) and decanoic (C10) acids as coupling agents in Pinus Elliottii fiber for treatment with graphene oxide (GO). Samples of Fiber, Fiber/GO, Fiber/GO/C6, Fiber/GO/C8 and Fiber/GO/C10 were prepared usingmechanical agitation and ultrasonication at two temperatures (25°C and 50°C). Their morphologies were evaluated by scanning electron microscopy and energy dispersive spectrometry; their chemical compositions by Fourier transform infrared spectroscopy; and their thermal stabilities by thermogravimetric analysis. The Fiber/GO/C8 and Fiber/GO/C10 samples treated at 25°C showed superior results in graphene oxide adhesion, as well as traces of treatment acids and a higher carbon-oxygen ratio. The Fiber/GO/C6 sample treated at 25°C showed greater thermal stability. The other samples treated at 50°C showed inferior performance, both in graphene oxide adhesion to the fiber surface, as well as in chemical compositions and carbon-oxygen correlation. Based on this, it was found that the treatment of wood fibers with octanoic acid at a temperature of 25°C was the best way to generate graphene oxide anchoring on the fiber surface. [resumo fornecido pelo autor]