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Title of Journal: Polym Bull

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Abbravation: Polymer Bulletin

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Springer-Verlag

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DOI

10.1007/bf00481270

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1436-2449

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A novel hydrophobically associating polyampholytes

Authors: Huiyong An Cuige Lu Pixin Wang Wenbo Li Ying Tan Kun Xu Chang Liu
Publish Date: 2011/03/17
Volume: 67, Issue: 1, Pages: 141-158
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Abstract

A novel hydrophobically associating polyampholytes of polyAM/AA/AMQC12 were synthesized by the free radical copolymerization of acrylamide AM acrylic acid AA and dimethyldodecyl2acrylamidoethylammonium bromide AMQC12 in water without any surfactants named AAQ series The structures of polymers were confirmed by 1H NMR and 13C NMR The molecular weight and polydispersity were obtained using gel permeation chromatography GPC The hydrophobically associated properties of polymer solution were characterized by rheology steadystate fluorescence probe and 1H NMR relaxation time T 2 Isoelectric points IEPs of polymer solution were determined by the effect of pH on viscosity below critical association concentrations cac and the reduced viscosities of samples at IEPs were increased in the presence of NaCl Moreover the steadyshear viscosity of sample at IEP was also greatly enhanced in NaCl solutions when the polymer concentration is above the cac Meantime the storage modulus and the loss modulus of copolymers showed that the sample behaved as gel in salt mediaThe authors are grateful to the Plan for Scientific and Technological Development of Jilin Province of China grant no 20096023 and Science and Technology Cooperation Fund Project of Jilin Province and Chinese Academy of Sciences grant no 2009SYHZ0027 for financial support of this work

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