Microrheology of poly(vinyl alcohol) aqueous solutions and chemically cross-linked gels

被引：38

作者：

Narita, T ^{[1
]}

Knaebel, A ^{[1
]}

Munch, JP ^{[1
]}

Candau, SJ ^{[1
]}

机构：

[1] Lab Dynam Fluides Complexes, F-67070 Strasbourg, France

来源：

MACROMOLECULES | 2001年 / 34卷 / 23期

关键词：

D O I：

10.1021/ma010890i

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 motion of probe particles in aqueous solutions of linear and branched poly(vinyl alcohol) (PVA) and in chemically cross-linked PVA gels has been studied by diffusing-wave spectroscopy. At long time scales the measurements allow to determine the effect of the cross-linking ratio on the macroscopic viscosity of sols and the shear modulus of gels. The local shear modulus of gels as obtained from the characteristic length of the Brownian cage was found to agree with that measured by classical rheometry and dynamic light scattering. The behavior of the mean-square displacement of the probe particles at short time indicates that the high-frequency viscoelasticity is the same for solutions and highly crosslinked gels whereas gels with low cross-linking ratio exhibit a lower storage modulus.

引用

页码：8224 / 8231

页数：8

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