SHEAR AND EXTENSIONAL VISCOSITY CHARACTERISTICS OF A SERIES OF HYDROPHOBICALLY ASSOCIATING POLYELECTROLYTES

被引:28
作者
KENNEDY, JC [1 ]
MEADOWS, J [1 ]
WILLIAMS, PA [1 ]
机构
[1] N E WALES INST, FAC SCI HLTH & MED STUDIES, CTR WATER SOLUBLE POLYMERS, CONNAHS QUAY CH5 4BR, FLINT, WALES
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1995年 / 91卷 / 05期
关键词
D O I
10.1039/ft9959100911
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The shear and extensional viscosity characteristics of aqueous solutions of a series of hydrophobically associating polyelectrolytes have been investigated and compared. The polymers studied consisted of a methacrylic acid/ethyl acrylate copolymer backbone containing varying levels of incorporation (0-2 mol%) of a pendant C-18 hydrophobe. The extensional viscosities of all solutions were found to be higher than their corresponding shear viscosities, with the calculated Trouton ratio tending towards the predicted value of three at low strain rates but increasing with increasing extensional strain rate thereafter. In both flow modes, the viscosities of the solutions increased with increasing concentration and hydrophobe content of the polymers. In contrast to the purely shear-thinning characteristics of the polymer solutions observed in shear flow, the extensional viscosity-strain rate profiles of a number of systems were found to contain an initial region of strain-thickening, although strain-thinning behaviour was observed at higher strain rates. For any given system, the strain rate at which the evident maxima in extensional viscosity occurred decreased with increasing polymer concentration. In the presence of additives such as excess surfactant or a miscible alcoholic non-solvent, which are known to disrupt regions of intermolecular hydrophobic associations, the extensional viscosity of a typical solution of an associative polyelectrolyte was found to be significantly reduced and no longer to exhibit a maximum in the viscosity-strain rate profile.
引用
收藏
页码:911 / 916
页数:6
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