文献类型：期刊文献

英文题名：Crystallization, thermal and mechanical properties of stereocomplexed poly(lactide) with flexible PLLA/PCL multiblock copolymer

作者：Jing, Zhanxin[1];Huang, Xiaolan[1];Liu, Xinqi[1];Liao, Mingneng[1];Zhang, Zhaoxia[1];Li, Yong[1]

机构：[1]Guangdong Ocean Univ, Coll Chem & Environm, Dept Appl Chem, Zhanjiang, Peoples R China

年份：2022

卷号：12

期号：21

起止页码：13180

外文期刊名：RSC ADVANCES

收录：SCI-EXPANDED(收录号：WOS:000789955200001)、、EI(收录号：20222012122029)、Scopus(收录号：2-s2.0-85130096977)、WOS

基金：This work was supported by the Natural Science Foundation of Guangdong Province (2018A030307020), College Featured Innovation Project of Guangdong Province (2020KTSC052), Science and Technology Plan Project of Zhanjiang City (2020A01027) and Nanhai Scholars Talent Funding Program of Guangdong Ocean University (002029002012).

语种：英文

外文关键词：Nucleation - Crystallization - Tensile strength - Fracture mechanics - Molecular weight - Crystal structure - Melting - Enantiomers

外文摘要：In this work, the synthesized PLLA/PCL multi-block copolymers with different compositions were introduced into a stereocomplexed poly(lactide) (sc-PLA) matrix to accelerate the stereocomplexation of PLA enantiomers and improve its inherent brittleness. The PLLA/PCL multi-block copolymers were in different compositions to adjust the molecular weight of the PLLA block. The structure, molecular weight, crystallization behavior, crystal structure and thermal stability of PLLA/PCL multi-block copolymers were investigated. The results indicated that PLLA/PCL multi-block copolymers with controllable structure and composition were successfully synthesized. On this basis, the blends of sc-PLA and PLLA/PCL multi-block copolymers were prepared by solution casting, and characterized. The results revealed that the introduction of PLLA/PCL multi-block copolymers promoted the stereocomplexation of the PLA enantiomers during the melting crystallization process to obtain a complete stereocomplexed material. But the presence of the PCL block leads to a decrease in the melting temperature of the stereocomplex and difficulty in homogeneous nucleation. Compared with sc-PLA, the elongation at break of the blends was significantly improved and their tensile strengths were only slightly reduced. And the thermal stability and mechanical properties of the blends could be adjusted by controlling the content and composition of PCL/PLLA multi-block copolymers. These results revealed that the degree of stereocomplexation and toughness of sc-PLA were improved, which may expand the application fields of PLA-based materials.