DILUTE AND SEMIDILUTE SOLUTIONS OF ABA BLOCK COPOLYMER IN SOLVENTS SELECTIVE FOR A-BLOCK OR B-BLOCK .1. SMALL-ANGLE X-RAY-SCATTERING STUDY

被引：49

作者：

PLESTIL, J ^{[1
]}

HLAVATA, D ^{[1
]}

HROUZ, J ^{[1
]}

TUZAR, Z ^{[1
]}

机构：

[1] CZECHOSLOVAK ACAD SCI, INST MACROMOLEC CHEM, CS-16206 PRAGUE 6, CZECHOSLOVAKIA

来源：

POLYMER | 1990年 / 31卷 / 11期

关键词：

block copolymer micelles; small-angle X-ray scattering; space correlation in semidilute solutions; zero-shear viscosity;

D O I：

10.1016/0032-3861(90)90083-B

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Solutions of a triblock copolymer, polystyrene-block-poly(hydrogenated butadiene)-block-polystyrene, in a selective solvent either for the aliphatic middle block (heptane) or for the polystyrene outer blocks (1,4-dioxane/25 vol% heptane) were studied by viscometry and small-angle X-ray scattering. In both systems, micelles were detected with uniform spherical cores formed by insoluble copolymer blocks. In semidilute solutions, in concentration regions above 0.01 g cm-3 in heptane and ∼0.1 g cm-3 in the mixed solvent, micelles were found to be space-correlated, the effect being accompanied by a steep increase in zero-shear viscosity. Aliphatic micellar cores in the mixed solvent are highly swollen due to the effect of selective sorption. © 1990.

引用

页码：2112 / 2117

页数：6

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