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Synthesis and Evaluation of Novel Proton Exchange Membranes Containing the Semisquaric Acid Group
Author(s) -
Yoshimura Ken,
Liebeskind Lanny S.
Publication year - 2010
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201000223
Subject(s) - squaric acid , hydrochloric acid , membrane , proton , polymer , polymer chemistry , group (periodic table) , chemistry , materials science , organic chemistry , biochemistry , physics , nuclear physics
Abstract We focus our attention here on semisquaric acid, which is known to show high acidity, as a new proton dissociating group for proton exchange membranes (PEMs). The introduction of a squaric acid group into aromatic polymers was conducted by the reaction of lithiated aromatic polymers and diisopropoxy squarate, followed by treatment with hydrochloric acid. A resulting polyphenylsulfone membrane with the squaric acid group introduced (PPSf‐SQ, IEC = 4.1 meq·g −1 ) showed proton conductivity of 1.0 × 10 −1 S·cm −1 at 80 °C under 95% relative humidity, which indicates that the semisquaric acid has the potential to become an alternative proton‐conducting group for PEMs.