Macroscopic response of wormlike micelles to elongational flow

被引：65
|
作者：
Walker, LM
Moldenaers, P
Berret, JF
机构：
[1] KATHOLIEKE UNIV LEUVEN,DEPT CHEM ENGN,B-3001 HEVERLEE,BELGIUM
[2] UNIV MONTPELLIER 2,DYNAM PHASES CONDENSEES GRP,F-34095 MONTPELLIER,FRANCE
来源：
LANGMUIR | 1996年 / 12卷 / 26期
关键词：
D O I：
10.1021/la960662v
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Opposed nozzle flow is used to measure the elongational properties of wormlike micelles. Well-characterized semidilute micellar solutions of CPCl/Sal in concentrated brine are used, By varying temperature and concentration, the viscoelastic properties (tau(R), G(0)) of the equilibrium solutions can be controlled and the influence of viscoelasticity on elongational viscosity probed. Results indicate three regimes of steady elongational behavior: a constant viscosity at low elongational rates, an increase to a maximum viscosity, and then a subsequent drop in viscosity. Scaling of the macroscopic elongational properties with linear viscoelastic parameters and similarities between these solutions and entangled polymer solutions indicate that semidilute CPCl/Sal solutions do not exhibit significant changes in micellar structure and may provide model systems for studying the influence of complex flow fields on entangled polymer solutions.
引用
收藏
页码：6309 / 6314
页数：6
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