ResumoNeste trabalho, foram obtidos compósitos poliméricos de Óxido de Grafite (GO) incorporado em Poli(metaclilato de metila) (PMMA). A obtenção do Óxido de Grafite foi realizada pelo método de Hummers modificado. Em seguida foi ainda adicionada uma etapa secundária de tratamento térmico à 1000ºC no GO obtido a fim de expandir as lamelas de grafite e remover os grupos funcionais aderidos durante o ataque ácido do grafite. As cargas obtidas foram caracterizadas com o auxílio das técnicas de Difração de Raios-X (DRX), constatando a expansão das folhas após o tratamento térmico. O estudo comparativo dos compósitos de matriz polimérica com 3 % de concentração de GO antes e após o tratamento térmico foi realizado com o objetivo de entender a contribuição nas propriedades reológicas do polímero com a adição da carga de GO. Os resultados reológicos apresentaram um aumento da viscosidade complexa tanto no ensaio de Varredura de Tempo, quanto no Cisalhamento Oscilatório de Pequenas Amplitudes (COPA). Palavras-chave: Compósito; Óxido de grafite; PMMA; Reologia. CHARACTERIZATION OF PMMA COMPOSITES REFORCED WITH GRAPHITE OXIDE AbstractIn this study, composites of graphite oxide (GO) in poly(methyl methacrylate) (PMMA) were obtained. Obtaining of graphite oxide was performed by modified Hummers method. Was further added a secondary GOs obtained heat treatment step of 1000° C in order to expand the graphite flakes and remove functional groups attached during the acid attack of graphite. The reinforcement obtained by both methods were characterized by X-Ray Diffraction (XRD), confirming the expansion of the leaves after the heat treatment. A comparative study of the polymer matrix composites with 3 % concentration of oxides graphite before and after the heat treatment was performed in order to understand the contribution on the polymer rheological properties with the addition of GO. The rheological results showed an increase in complex viscosity at both measurement of Time Sweep, as in Small Amplitude Oscillatory Shear (SAOS).
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