Interplay of microphase separation, crystallization and liquid crystalline ordering in crystalline/liquid crystalline block copolymers

被引：14
|
作者：
Tong, Zaizai [1 ]
Zhou, Junyi [1 ]
Wang, Rui-Yang [2 ]
Xu, Jun-Ting [2 ]
机构：
[1] Zhejiang Sci Tech Univ, Key Lab Adv Text Mat & Mfg Technol ATMT, Dept Mat Sci & Engn, Minist Educ, Hangzhou 310018, Zhejiang, Peoples R China
[2] Zhejiang Univ, Dept Polymer Sci & Engn, MOE Key Lab Macromol Synth & Functionalizat, Hangzhou 310827, Zhejiang, Peoples R China
来源：
POLYMER | 2017年 / 130卷
基金：
中国国家自然科学基金;
关键词：
Crystallization; Liquid crystalline; Microphase separation; AMORPHOUS DIBLOCK COPOLYMER; MELTING BEHAVIOR; THERMOPLASTIC ELASTOMERS; CONFINED CRYSTALLIZATION; LAMELLAR MORPHOLOGY; TRIBLOCK COPOLYMERS; ALPHA-FORM; POLY(L-LACTIDE); KINETICS; PHASE;
D O I：
10.1016/j.polymer.2017.09.071
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
A series of liquid crystalline/crystalline block copolymers (BCPs) containing poly(methacrylate) block with liquid crystalline (LC) azobenzene moieties in the side chains (PMMAzo) and crystalline block poly(L-lactide) (PLLA) were prepared. The interplay of microphase separation, crystallization and LC ordering in these BCPs was investigated. It is revealed that microphase separation between two blocks is favorable to the LC ordering, which is attributed to the enhanced local concentration of LC moieties in PMMAzo microdomains. For a similar reason, crystallization of PLLA can intensify microphase separation thus facilitate LC ordering of PMMAzo. PLLA crystallization may also stabilize the LC structure, leading to phase transition temperatures of the BCPs higher than that of PMMAzo homopolymer. On the other hand, the LC ordering can conversely affect crystallization of PLLA. The crystallizability of PLLA is weakened by the chemically linked PMMAzo block. The special PLLA e-crystals, which are usually formed in the presence of organic solvents, are unexpectedly observed under suitable conditions. (C) 2017 Elsevier Ltd. All rights reserved.
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页码：1 / 9
页数：9
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