期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 4, 期 5, 页码 2680-2688出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b00191
关键词
Poly(lactic acid); Stereocomplex; Crystalline structure; Crystal morphology; Nucleator; Hydrogen bonding
资金
- Natural Science Foundation of China [21422406]
- Fundamental Research Funds for the Central Universities [2015XZZX004-08]
Stereocomplex (SC) crystallization has been an effective method to improve the heat resistance of poly(lactic acid) (PLA). However, the preparation of SC-type PLA material is still a challenge because SC crystallization is much less prevailing than homocrystallization in the high-molecular-weight (HMW) poly(L-lactic acid)/poly(D-lactic acid) (PLLA/PDLA) racemic blends. In this study, we have successfully promoted SC formation and controlled crystal morphology of a HMW PLLA/PDLA blend by using a self-assemblable aryl amide nucleator, N,N',N ''-tricyclohexyl-1,3,5-benzenetricarboxylamide (BTCA). Crystallization kinetics, polymorphic crystalline structure, crystal morphology and superstructure of BTCA-nucleated PLLA/PDLA blends were investigated. During the nonisothermal melt crystallization and isothermal crystallization at different temperatures (80-170 degrees C), the crystallization rate of PLLA/PDLA blend is significantly promoted and the fraction of SCs is enhanced with incorporating small amount of BTCA. SCs are exclusively formed in the BTCA-nucleated PLLA/PDLA blends at a high crystallization temperature (e.g., 170 degrees C). Because of the diversified self-assembled structure of BTCA in polymer melts, SCs with short, long shish-kebab-like, and granular structures are attained with varying the BTCA concentration. BTCA-promoted SC formation of PLLA/PDLA blend is ascribed to the hydrogen bonding interactions between BTCA and PLLA, PDLA chains.
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