SEGREGATION OF BLOCK COPOLYMERS TO INTERFACES BETWEEN IMMISCIBLE HOMOPOLYMERS

被引:181
作者
SHULL, KR [1 ]
KRAMER, EJ [1 ]
HADZIIOANNOU, G [1 ]
TANG, W [1 ]
机构
[1] CORNELL UNIV,DEPT MAT SCI & ENGN,ITHACA,NY 14853
关键词
D O I
10.1021/ma00224a006
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 equilibrium segregation of deuterated polystyrene–poly(2-vinylpyridine) diblock copolymers to interfaces between high molecular weight polystyrene and poly(2-vinylpyridine) homopolymers was measured by forward recoil spectrometry. The dependence of the integrated segregation on the equilibrium copolymer concentration in the PS phase is compared to predictions from a mean-field theory in which the copolymer chemical potential is the relevant parameter. Predictions from the theory are quantitatively accurate for values of the copolymer chemical potential, which are below a certain limiting value associated with the formation of block copolymer micelles. The segregation behavior in the regime where micelles are present is complicated by a strong tendency for micelles to segregate to the free polystyrene surface and by a weaker tendency for micelles to segregate to the interfacial region. Values of the copolymer chemical potential at the micelle transition are obtained from a careful analysis of the data and are in reasonable agreement with predictions from a simplified theory of micelle formation. © 1990, American Chemical Society. All rights reserved.
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页码:4780 / 4787
页数:8
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