微晶
结晶
乳酸
材料科学
对映体
傅里叶变换红外光谱
纳米纤维
化学工程
纤维素
化学
产量(工程)
战术性
高分子化学
聚合物
有机化学
复合材料
细菌
工程类
生物
冶金
遗传学
聚合
作者
Qian Ren,Minghui Wu,Zhengsheng Weng,Xiang Zhu,Wanwan Li,Pengke Huang,Long Wang,Wenge Zheng,Masahiro Ohshima
标识
DOI:10.1016/j.carbpol.2021.118800
摘要
Stereocomplex (SC) crystallization between enantiomeric poly(L-lactic acid) (PLLA) and poly(D-lactic acid) (PDLA) is believed to yield poly(lactic acid) (PLA) with superior physiochemical properties. However, homocrystallization (HC) crystallites are inevitably generated in the PLLA/PDLA blends. Herein, we report a simple approach to fabricate PLLA/PDLA racemic blends with high contents of SC crystallites by introducing cellulose nanofibers (CNFs). The isothermal crystallization results revealed that the half-crystallization time of the PLLA/PDLA blend was significantly decreased by adding CNFs. Additionally, with the incorporation of 3 wt% modified CNFs, the PLLA/PDLA blend was overwhelmingly crystallized into SC crystallites with no HC crystallite formation. Based on Fourier transform infrared spectroscopy findings, it was speculated that the preferred SC crystallization of PLLA/PDLA/CNF was caused by enhanced interchain molecular interactions between CNFs and PLA. This work presents a feasible and efficient method to fabricate PLA with exclusively SC crystallites, which possesses great potential for producing high-performance PLA materials.
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