Characterization of Poly(styrene-b-vinylbenzylphosphonic acid) Copolymer by Titration and Thermal Analysis

Sang Hun Kim; Young Chul Park; Gui Hyun Jung; Chang Gi Cho

Macromolecular Research, Vol.15, No.6, 587-594, October, 2007

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Characterization of Poly(styrene-b-vinylbenzylphosphonic acid) Copolymer by Titration and Thermal Analysis

Sang Hun Kim, Young Chul Park, Gui Hyun Jung, and Chang Gi Cho^†

Center for Advanced Functional Polymers, Department of Fiber & Polymer Engineering, Hanyang University, Seoul 133-791, Korea

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Well defined amphiphilic diblock copolymers of poly(styrene-b-vinylbenzylphosphonic acid) (PS-b-PVBPA) were prepared by controlled radical polymerization technique, two-step hydrolysis reactions using trimethylsilyl bromide from the corresponding phosphonic ethyl ester. By indirect, backward pH titration of the block copolymer, a good titration curve of a dibasic acid was observed. The IEC values obtained from both backward pH titration and volumetric back titration were almost identical. Thermal gravimetric analysis (TGA) of the phosphonic acid containing block copolymer showed a high thermal stability up to 400 ℃.

Keywords:ion exchange capacity;poly(vinylbenzylphosphonic acid);block copolymer;proton exchange membrane;thermal stability

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