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Polymers and Polymer Composites

COMPARATIVE RHEOLOGICAL PROPERTIES OF DOPE SOLUTIONS OF HIGH MOLAR-MASS POLY(ACRYLONITRILE-CO-METHYLACRYLATE-CO-ITACONIC ACID)

August 1, 2004 By: Devasia R; Nair C P R; Ninan K N Research article

Title: COMPARATIVE RHEOLOGICAL PROPERTIES OF DOPE SOLUTIONS OF HIGH MOLAR-MASS POLY(ACRYLONITRILE-CO-METHYLACRYLATE-CO-ITACONIC ACID)
Page Range: p.667-677
Author(s): Devasia R; Nair C P R; Ninan K N
File size: 244K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 8

Abstract
The rheological behaviour of a dope solution of poly(acrylonitrile-co-itaconic acid) copolymer was compared with that of a poly(acrylonitrile-co-methylacrylate-co-itaconic acid) terpolymer of identical molecular weight. The effects of temperature, concentration and shear force on the rheology of the polymer dope were examined. It was found that in both cases, the temperature dependence of zero shear viscosity conformed to the Arrhenius-Frenkel-Eyring equation. The free energy change increased with concentration more significantly for the copolymer than the terpolymer. The Power Law model was fitted to the shear dependency of the viscosity, and the pseudoplasticity index was shown to decrease with the dope concentration. The shear thinning behaviour was more pronounced for the terpolymer than the copolymer. Empirical models were derived which were able to predict the pseudoplasticity index value of the polymers of a given viscosity-average molecular weight at any concentration and temperature. The onset of shear thinning shifted to a lower shear regime with an increase in solid concentration. 26 refs.

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