Polysaccharide Nanocomposites Reinforced with Graphene Oxide and Keratin-Grafted Graphene Oxide

Nanocomposites of polysaccharide matrices, chitosan–starch, and carboxymethyl cellulose-starch reinforced with graphene oxide and graphene grafted with keratin were developed. Composites films had been prepared for the casting/solvent evaporation method. The interaction and distribution of graphene materials in the biopolymer matrices were analyzed by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and scanning electron microscopy (SEM), and the thermomechanical properties were examined using dynamic mechanical analysis. The nanocomposites of the chitosan–starch matrix improved their mechanical properties substantially, with respect to the film without reinforcing, obtaining an increase of 929% in the storage modulus (E′, 35 °C) with only 0.5 wt % of graphene oxide and outstanding increments in E′ at 150 and 200 °C when keratin-grafted graphene oxide is incorporated (0.1 wt %). In contrast, the graphene oxide incorporated into the carboxymethyl cellulose–starch matrix tends to decrease...

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