Abstract
The effects of graphene oxide (GO) with polar groups and functionalized GO (fGO) with nonpolar groups on the isothermal crystallization of poly(L-lactide) (PLLA) were compared. Functionalized GO was obtained by grafting octadecylamine and characterized by FTIR, WAXD and TGA. Isothermal crystallization kinetics of PLLA/GO and PLLA/fGO nanocomposites were investigated by combining DSC data and Avrami equation. The results showed that fGO could improve PLLA crystallization rate more obviously than GO. By analyzing the morphology obtained from POM, SEM and TEM, it was found fGO with large layer space dispersed better in PLLA and supplied more nucleation sites than GO. Therefore, for the multilayer graphene, increasing the layer spaces is important to improve its dispersion in polymers, which will cause the crystal kinetics changing of polymers.
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This work was financially supported by the National Natural Science Foundation of China (Nos. 51503117 and 51403119) and Promotive Research Fund for Excellent Young and Middle-aged Scientisits of Shandong Province (No. BS2013CL032).
Electronic Supplementary Material Supplementary material is available in the online version of this article at http://dx.doi.org/10.1007/s10118-016-1732-5.
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Zhao, Lf., Li, Q., Zhang, Rl. et al. Effects of functionalized graphenes on the isothermal crystallization of poly(L-lactide) nanocomposites. Chin J Polym Sci 34, 111–121 (2016). https://doi.org/10.1007/s10118-016-1732-5
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DOI: https://doi.org/10.1007/s10118-016-1732-5