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Regulation of the mechanical properties and heat resistance of the poly( l ‐lactide‐ co ‐trimethylene carbonate) copolymer by the incorporation of a stereocomplex crystal and graphene oxide
Author(s) -
Li Qi,
Tian Xiujuan,
Yu Cuixiang,
Zhang Ruliang,
Wei Shuxin,
Zhao Lifen
Publication year - 2017
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.45248
Subject(s) - crystallization , materials science , crystallinity , differential scanning calorimetry , nucleation , lactide , copolymer , chemical engineering , crystal (programming language) , polymer chemistry , graphene , oxide , dynamic mechanical analysis , composite material , polymer , organic chemistry , chemistry , nanotechnology , thermodynamics , physics , computer science , metallurgy , engineering , programming language
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. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45248.