Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 473, Issue -, Pages 226-236Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2014.09.015
Keywords
Branched polymer; Star-shaped; Block poly(arylene ether)s; Oxidative stability; Proton exchange membrane
Categories
Funding
- National Nature Science Foundation of China [51171117, 51306125, 51101103]
- Shenzhen Sic Tech Research [JC20110, 42100070A, ZYC201105170225A]
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Star-shaped sulfonated block copoly(ether ketone)s exhibit excellent properties for use as proton exchange membranes (PEMs). However, very few investigations of the use of highly branched star-shaped sulfonated block polymers as PEMs have been reported. In this work, two types of highly branched star-shaped sulfonated block poly(arylene ether)s with 6% branching agent were synthesized via direct polycondensation reactions of a trifunctional core (branching agent) with sullonated 4,4'-difluorobenzophenone, bisphenol fluorene, and 4,4'-difluorocliphenyl sullone. The properties of a polymer with hydrophilic segments surrounded by hydrophobic segments (P1) and a polymer with hydrophobic segments surrounded by hydrophilic segments (P2) were investigated. The block polymer P1 exhibited better oxidative stability (332 min) and dimensional stability (< 12%) than the highly branched sullonated random polymer (P3), whereas P2 exhibited higher proton conductivity (0.40 S cm(-1) at 80 degrees C) and water uptake (59.1% at 80 degrees C) than P3. The highly branched star-shaped sulfonated block poly(arylene ether)s exhibit greater potential than P3 for use as PEMs. (C) 2014 Elsevier B.V. All rights reserved.
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