Shear-induced demixing and shear-banding instabilities in dilute triblock copolymer solutions

被引：51
|
作者：
Waton, G [1 ]
Michels, B [1 ]
Steyer, A [1 ]
Schosseler, F [1 ]
机构：
[1] Lab Dynam Fluides Complexes, UMR 7506, F-67070 Strasbourg, France
来源：
MACROMOLECULES | 2004年 / 37卷 / 06期
关键词：
D O I：
10.1021/ma0349332
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
We study dilute aqueous solutions of a triblock copolymer PEO-PPO-PEO (Pluronics P84) by rheometry coupled with small-angle light scattering. The zero-shear viscosity increases by 5 orders of magnitude upon increase of temperature from 30 to 40.5 degreesC. This increase can be explained by the growth of spherical micelles to entangled cylindrical aggregates. In the non-Newtonian regime, we find evidence for shear-induced demixing below 37.7 degreesC and for gradient shear banding above this temperature. Thus, above a critical temperature the shear-induced demixing triggered by the flow in the vicinity of the cloud point (43 degreesC) appears linked to a phase separation of regions with different shear rates. At fixed concentration, the control parameters of the dynamic phase diagram are the temperature and the flow.
引用
收藏
页码：2313 / 2321
页数：9
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