CRYSTAL MORPHOLOGY OF BIODEGRADABLE POLY(LACTIC ACID)/GRAPHENE OXIDE NANOCOMPOSITES AND THE ISOTHERMAL CRYSTALLIZATION KINETICS RESEARCH

摘要

The biodegradable poly(lactic acid) (PLA)/graphene oxide (GO) nanocomposites were prepared successfully at various GO loading by solution casting. Wide angle X-ray diffraction (WAXD) showed the layered GO were exfoliated in the nanocomposites and well distributed. Evident crystallization peaks were observed in the PLA/GO nanocomposites rather than neat PLA in the nonisothermal melt crystallization test, which indicated the GO was an effective nucleating agent. For isothermal melt crystallization, the overall isothermal melt crystallization rates were significantly greater in the nanocomposites than in neat PLA. The crystallization rates decreased with increasing crystallization tempera- ture. The incorporation of GO did not affect the crystal morphology of PLA in the nanocomposites, but it contributed to more regular and perfect crystallization structure.