A shear induced transition of lamellar alignment in a concentrated diblock copolymer solution

被引：29

作者：

Pople, JA

Hamley, IW

Fairclough, JPA

Ryan, AJ

Hill, G

Price, C

机构：

[1] Univ Leeds, Sch Chem, Leeds LS2 9JT, W Yorkshire, England

[2] Univ Sheffield, Dept Chem, Sheffield S3 7HF, S Yorkshire, England

[3] SERC, Daresbury Lab, CLRC, Warrington WA4 4AD, Cheshire, England

[4] Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England

来源：

POLYMER | 1999年 / 40卷 / 20期

基金：

英国工程与自然科学研究理事会;

关键词：

diblock copolymer solution; ordered phase; SAXS;

D O I：

10.1016/S0032-3861(98)00805-2

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 effect of shear on the alignment of the lamellar phase in a concentrated aqueous salt solution of a poly(oxyethylene) and poly(oxybutylene) diblock copolymer is investigated in situ using small-angle X-ray scattering (SAXS). The alignment of the lamellae is deduced from the anisotropy of the scattering patterns. It is found that the orientation of the lamellae with respect to the shear direction alters with an increase in the shear rate: the lamellae are oriented transverse to the shear direction at low shear rates, and perpendicular to the vorticity direction at high shear rates. The transition between the two lamellar alignments occurs at a critical shear rate in the range: 10 s(-1) < gamma(c) < 100 s(-1). (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：5709 / 5714

页数：6

共 23 条

[1] Structural polymorphism of amphiphilic copolymers: Six lyotropic liquid crystalline and two solution phases in a poly(oxybutylene)-b-poly(oxyethylene)-water-xylene system [J].