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Polymers 2016, 8(4), 114; doi:10.3390/polym8040114

Studies of Grafted and Sulfonated Spiro Poly(isatin-ethersulfone) Membranes by Super Acid-Catalyzed Reaction

Department of Applied Chemistry, Konkuk University, Chungju 380-701, Korea
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Changsik Song
Received: 2 February 2016 / Revised: 22 March 2016 / Accepted: 24 March 2016 / Published: 29 March 2016
(This article belongs to the Special Issue Conductive Polymers 2016)
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Abstract

Spiro poly(isatin-ethersulfone) polymers were prepared from isatin and bis-2,6-dimethylphenoxyphenylsulfone by super acid catalyzed polyhydroxyalkylation reactions. We designed and synthesized bis-2,6-dimethylphenoxyphenylsulfone, which is structured at the meta position steric hindrance by two methyl groups, because this structure minimized crosslinking reaction during super acid catalyzed polymerization. In addition, sulfonic acid groups were structured in both side chains and main chains to form better polymer chain morphology and improve proton conductivity. The sulfonation reactions were performed in two steps which are: in 3-bromo-1-propanesulfonic acid potassium salt and in con. sulfuric acid. The membrane morphology was studied by tapping mode atomic force microscope (AFM). The phase difference between the hydrophobic polymer main chain and hydrophilic sulfonated units of the polymer was shown to be the reasonable result of the well phase separated structure. The correlations of proton conductivity, ion exchange capacity (IEC) and single cell performance were clearly described with the membrane morphology. View Full-Text
Keywords: PEM; super acid; spiro structure; dimensional stability; proton conductivity; carbon-carbon linkage PEM; super acid; spiro structure; dimensional stability; proton conductivity; carbon-carbon linkage
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jin, L.; Jang, H.; Yoo, J.; Ha, J.; Choi, K.; Ryu, T.; Lee, S.; Kim, W. Studies of Grafted and Sulfonated Spiro Poly(isatin-ethersulfone) Membranes by Super Acid-Catalyzed Reaction. Polymers 2016, 8, 114.

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