Crystallization of equimolar poly(L-lactide)/poly(D-lactide) blend below the melting point of α crystals under shear

被引：17
|
作者：
Song, Yan [1 ]
Zhang, Xiuqin [2 ]
Yin, Yongai [1 ]
Zhang, Chunbo [1 ]
de Vos, Sicco [3 ]
Wang, Ruyin [4 ]
Joziasse, Cornelis A. P. [3 ]
Liu, Guoming [1 ]
Wang, Dujin [1 ]
机构：
[1] Chinese Acad Sci, Inst Chem, CAS Key Lab Engn Plast, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
[2] Beijing Inst Fash Technol, Sch Mat Sci & Engn, Beijing 100029, Peoples R China
[3] Corb Purac, POB 21, NL-4200 AA Gorinchem, Netherlands
[4] Corb Purac China, Unit 08 09, 30F 6088 Humin Rd, Shanghai 201199, Peoples R China
来源：
EUROPEAN POLYMER JOURNAL | 2016年 / 75卷
基金：
中国国家自然科学基金;
关键词：
Poly(lactic acid); Stereocomplex; Shear; Crystallization kinetics; POLY(L-LACTIC ACID); STEREOCOMPLEX FORMATION; ISOTACTIC POLYPROPYLENE; POLY(LACTIC ACID); MOLECULAR-WEIGHT; NONISOTHERMAL CRYSTALLIZATION; POLYLACTIDE STEREOCOMPLEX; INDUCED NUCLEATION; BEHAVIOR; FLOW;
D O I：
10.1016/j.eurpolymj.2015.12.001
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The isothermal crystallization behavior of a 1:1 poly(L-lactide)/poly(D-lactide) (PLLA/PDLA) mixture under pulsed shear was investigated by in-situ polarized light optical microscopy (POM) and wide angle X-ray scattering (WAXS). The effects of shear rate and temperature were studied. The results showed that application of shear flow increased the nucleation density, crystallization rate and degree of orientation for both stereocomplex crystals (SC) and alpha crystals. Interestingly, when the crystallization temperature was below the melting temperature of a crystals, the phase content of SC increased with shear rate, while the a content displayed a bell-shaped curve with regard to shear rate. The structure formation in this system was closely related to the shear-induced nucleation, phase mixing and chain mobility. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：93 / 103
页数：11
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