▎ 摘　　要

Stereocomplex crystals of polylactide and graphene oxide (GO) were simultaneously used to regulate the mechanical properties and heat resistance of a poly(l-lactide-co-trimethylene carbonate) [P(LLA-co-TMC)] copolymer. The crystallization behaviors in the nonisothermal cold-crystallization process of P(LLA-co-TMC)-poly(d-lactide) (PDLA) blends and P(LLA-co-TMC)-PDLA-GO composites were investigated by differential scanning calorimetry, wide-angle X-ray diffraction, and polarized optical microscopy. Data from the crystallization kinetics and the crystallization active energy indicated that GO both promoted nucleation and limited growth during the stereocomplex crystallization process. Three kind of samples (without crystallization, with low crystallinity, and with high crystallinity) were used to investigate the mechanical properties and heat resistance. We found a decrease in the elongation at break when the stereocomplex crystal and GO contents were increased, and this was accompanied by an improvement in the tensile strength. The change in the storage modulus value determined by dynamic mechanical analysis demonstrated that both the stereocomplex crystal and GO effectively improved the heat resistance. These results indicate that this study provided a new strategy for fabricating a P(LLA-co-TMC) copolymer with good comprehensive properties at was entirely different from common chemical crosslinking methods. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45248.