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Proton conductive reinforced poly(ethylene‐ co ‐styrene) membranes
Author(s) -
Annala Minna,
Lipponen Sami,
Kallio Tanja,
Seppälä Jukka
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.35157
Subject(s) - copolymer , membrane , ionomer , styrene , materials science , polymer chemistry , sulfonic acid , polymer , conductivity , ion exchange , polyelectrolyte , proton exchange membrane fuel cell , conductive polymer , chemical engineering , polymerization , chemistry , ion , composite material , organic chemistry , biochemistry , engineering
Polymers with ionic conductivity are useful materials for ion exchange membranes, separators, and electrolytes in electrochemical cells. New ionomers are currently being sought to replace the ionomers, which contain fluorine and are harmful to environment and expensive. A new and promising ionomer is a sulfonated ethylene/styrene copolymer. A nearby alternating copolymer with styrene content of 47 mol % was polymerized with metallocene/MAO catalyst. Membranes were prepared by hot‐pressing copolymer films with a glassfiber tissue. Phenyl rings in the copolymers were sulfonated with chlorosulfonic acid as a sulfonating agent. As the alternating structure of the copolymer, sulfonic groups were evenly distributed along the membranes. The membranes were characterized by determining water uptake, ion exchange capacity, proton conductivity, and mechanical properties. The studies revealed that the sulfonated copolymers have promising properties for proton‐conducting applications. All membranes had good ion exchange capacity, ∼ 3.5 meq/g, and proton conductivity, over 50 mS/cm. Due to the high water uptake of the sulfonated copolymer, mechanical properties of the membranes were improved by using the glassfiber tissue as reinforcement. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012