THE RHEOLOGY OF ENTANGLED POLYMERS AT VERY HIGH SHEAR RATES

被引：150

作者：

CATES, ME

MCLEISH, TCB

MARRUCCI, G

机构：

[1] UNIV NAPLES,DIPARTIMENTO INGN CHIM,I-80125 NAPLES,ITALY

[2] UNIV SHEFFIELD,DEPT PHYS,SHEFFIELD S3 7RH,S YORKSHIRE,ENGLAND

来源：

EUROPHYSICS LETTERS | 1993年 / 21卷 / 04期

关键词：

NON-NEWTONIAN DYNAMICS; VISCOELASTICITY; MACROMOLECULES AND POLYMER MOLECULES;

D O I：

10.1209/0295-5075/21/4/012

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

One of the (few) unrealistic features of the Doi-Edwards model for entangled polymers is that it predicts a steady-state shear stress which decreases indefinitely as the shear rate is increased. As shown by Marrucci and Grizzuti (Gazz. Chim. Ital., 118 (1988) 179) this feature remains, even when one takes into account chain stretching due to elongation of the tube by the flow. Here we suggest a further mechanism for chain stretching which arises because the tube, even when fully aligned with the flow, has a finite lateral dimension which exposes different parts of the chain to different flow velocities. Using a simplified model, we predict the asymptotic behaviour of the shear stress and first-normal-stress difference, and show that stable flow is recovered at high enough shear rates.

引用

页码：451 / 456

页数：6

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