Title

Synthesis and Characterization of Star-Branched Ionomers Composed of Sulfonated Polystyrene Outer Blocks and Elastomeric Inner Blocks

Document Type

Article

Publication Date

7-21-1989

Department

Polymers and High Performance Materials

Abstract

Star-branched ionomers composed of short sulfonated polystyrene outer blocks and hydrogenated butadiene or isoprene inner blocks, with narrow molecular weight distributions (<1.1), have been synthesized by living anionic polymerization and chlorosilane linking techniques, with subsequent hydrogenation and sulfonation reactions. The products are low molecular weight thermoplastic elastomers. Elasticity of the hydrogenated segments was obtained by varying the polymerization conditions, thereby controlling the % 1,2-addition of butadiene. Quantitative 13C and 1H NMR and FT-IR revealed > 99% hydrogenation using p-toluene sulfonyl hydrazide in refluxing toluene. Titration of the sulfonic acid groups revealed > 85% sulfonation of the styrene units by acetyl sulfate in methylene chloride. Characterization of the final product and the various intermediates was carried out by GPC, DSC, FT-IR, and 13C NMR. A summary of the developmental work leading to these new materials is presented.

Publication Title

ACS Symposium Series

Volume

395

First Page

330

Last Page

352

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