Role of PEG Segment in Stereocomplex Crystallization for PLLA/PDLA-b-PEG-b-PDLA Blends

被引：55
作者：
Song, Yan [1 ,3 ]
Wang, Dujin [1 ]
Jiang, Ni [1 ]
Gan, Zhihua [2 ]
机构：
[1] Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing 100190, Peoples R China
[2] Beijing Univ Chem Technol, Coll Life Sci & Technol, Beijing Lab Biomed Mat, State Key Lab Organ Inorgan Composites, Beijing 100029, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
ACS SUSTAINABLE CHEMISTRY & ENGINEERING | 2015年 / 3卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Poly(L-lactic acid); PDLA-b-PEG-b-PDLA; Blend; Stereocomplex crystallization; Morphology; POLY(LACTIC ACID) BLENDS; POLY(ETHYLENE GLYCOL); POLYLACTIDE STEREOCOMPLEX; POLY(L-LACTIC ACID); PHASE-SEPARATION; POLYMER BLENDS; MELT; COPOLYMERS; MORPHOLOGY;
D O I：
10.1021/acssuschemeng.5b00214
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The isothermal crystallization behavior and morphology of neat poly(L-lactic acid) (PLLA) and its blends with poly(D-lactic acid) (PDLA) and PDLA-b-poly(ethylene glycol) (PEG)-b-PDLA have been investigated. The glass transition temperature of the PLLA/PDLA blend, and especially the PLLA/PDLA-b-PEG-b-PDLA blend, is much lower than that of neat PLLA, indicating the plasticization effect of both low molecular weight PDLA and flexible PEG block. Both the PLLA/PDLA and PLLA/PDLA-b-PEG-b-PDLA blends can form stereocomplex (SC) crystals. However, the PDLA in the PLLA/PDLA blend postponed the crystallization rate of the blend, whereas the PEG chains in PLLA/PDLA-b-PEG-b-PDLA not only promoted the formation of SC crystals but also facilitated the crystallization of the PLLA matrix. The evolution of the crystal structure and morphologies of PLLA and its blends during the isothermal crystallization process have revealed the significant role of flexible PEG chains in the stereocomplex crystallization.
引用
收藏
页码：1492 / 1500
页数：9
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