Microsecond relaxation processes in shear and extensional flows of weakly elastic polymer solutions

被引：0

作者：

Damien C. Vadillo

Wouter Mathues

Christian Clasen

机构：

[1] University of Cambridge,Department of Chemical Engineering and Biotechnology

[2] University of Leuven (KU Leuven),Department of Chemical Engineering

[3] AkzoNobel Research,undefined

[4] Development and Innovation,undefined

来源：

Rheologica Acta | 2012年 / 51卷

关键词：

Polymer solution; Linear viscoelasticity; Nonlinear viscoelasticity; Extensional flow; Necking, Relaxation time;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

In this paper, we introduce an experimental protocol to reliably determine extensional relaxation times from capillary thinning experiments of weakly elastic dilute polymer solutions. Relaxation times for polystyrene in diethyl phthalate solutions as low as 80 μ s are reported: the lowest relaxation times in uniaxial extensional flows that have been assessed so far. These data are compared to the linear viscoelastic relaxation times that are obtained from fitting the Zimm spectrum to high frequency oscillatory squeeze flow data measured with a piezo-axial vibrator (PAV). This comparison demonstrates that the extensional relaxation time reduced by the Zimm time, λext/λz, is not solely a function of the reduced concentration c/c*, as is commonly stated in the literature: an additional dependence on the molecular weight is observed.

引用

页码：755 / 769

页数：14

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