Rheology of ''wet'' polymer brushes via Brownian dynamics simulation: Steady vs oscillatory shear

被引：61

作者：

Doyle, PS

Shaqfeh, ESG

Gast, AP

机构：

[1] Department of Chemical Engineering, Stanford University, Stanford, CA

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.78.1182

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The rheology of solvent-filled polymer brushes under steady and oscillatory shear is studied by Brownian dynamics simulation. The flow field is solved self-consistently with the polymer dynamics. We find that under steady flow the brushes are shear thinning in both normal forces and shear viscosity. During oscillatory flow, extreme shear thickening occurs when the ratio of the Weissenberg number to the dimensonless flow frequency Wi/omega approximate to 3. Shear-induced diffusion is shown to create this thickening. These findings serve to explain the recent measurements made by Klein et al.

引用

页码：1182 / 1185

页数：4

共 23 条

[1] MODEL FOR HYDRODYNAMIC THICKNESS OF THIN POLYMER LAYERS AT SOLID LIQUID INTERFACES [J].