RANDOM MULTIBLOCK COPOLYMER-HOMOPOLYMER BLENDS - EFFECT OF SEQUENCE DISTRIBUTION AND INTRAMOLECULAR REPULSION

被引:7
作者
ANGERMAN, H [1 ]
HADZIIOANNOU, G [1 ]
TENBRINKE, G [1 ]
机构
[1] UNIV GRONINGEN,CTR MAT SCI,9747 AG GRONINGEN,NETHERLANDS
来源
PHYSICAL REVIEW E | 1994年 / 50卷 / 05期
关键词
D O I
10.1103/PhysRevE.50.3808
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Recently, Fredrickson, Milner, and Leibler [Macromolecules 25, 6341 (1992)] introduced a mean-field analysis of linear random A-B multiblock copolymer melts, taking the sequence distribution explicitly into account. Here, we extend this approach to mixtures with homopolymers P(C). Within the simple Flory-Huggins description, miscibility in random copolymer-homopolymer mixtures is often attributed to unfavorable A-B interactions described by a positive Flory-Huggins parameter AB (intramolecular repulsion). The introduction of the sequence distribution sets an upper limit to this effect. For sufficiently large values of AB the mixture phase separates again, very much like the pure copolymer melt. Likewise, miscibility improves in the direction of the alternating sequence distribution. Our analysis rationalizes frequently observed sequence distribution effects in random copolymer blends. © 1994 The American Physical Society.
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页码:3808 / 3813
页数:6
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