Influence of compositional gradient on the phase behavior of ternary symmetric homopolymer-copolymer blends: A Monte Carlo study

被引：13
作者：
Sun, Dachuan [1 ]
Guo, Hongxia [1 ]
机构：
[1] Chinese Acad Sci, Beijing Natl Lab Mol Sci, Joint Lab Polymer Sci & Mat, State Key Lab Polymer Phys & Chem,Inst Chem, Beijing 100190, Peoples R China
来源：
POLYMER | 2011年 / 52卷 / 25期
基金：
中国国家自然科学基金;
关键词：
Gradient copolymers; Phase behavior; Monte Carlo simulation; POLYMERIC BICONTINUOUS MICROEMULSIONS; MEAN-FIELD APPROACH; BLOCK-COPOLYMERS; DIBLOCK COPOLYMER; INTERFACIAL ACTIVITY; COMPUTER-SIMULATION; MOLECULAR-DYNAMICS; CAPILLARY WAVES; MODEL; MIXTURES;
D O I：
10.1016/j.polymer.2011.10.039
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 formation of bicontinuous microemulsions (BUEs) in ternary symmetric blends including two immiscible homopolymers A and B as well as a linear gradient copolymer G is verified by Monte Carlo simulations. Four phase diagrams as a function of segregation strength and blend composition are constructed to show the effects of compositional gradient. Compared with the blends of A/B/diblock copolymers, the BUE phase occupies a broader region in the phase diagram of the A/B/G blends and is replaced by the three-phase coexistence phases of A + B + L or A + B + D at a much lower chain length ratio. Moreover, the lamellar phase is formed at a higher value of segregation strength, has a shorter periodic length and lower orientational order, and spans a narrower range of the phase diagram. A "counteraction effect" is proposed to explain those discrepancies caused by gradient copolymers. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：5922 / 5932
页数：11
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