Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 325, Issue 1, Pages 319-325Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2008.07.043
Keywords
Atom transfer radical polymerization (ATRP); Comb copolymer; Crosslinked; Proton conductivity; Anhydrous polymer electrolyte membrane
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Funding
- Korea Research Foundation
- Korean Government (MOEHRD, Basic Research Promotion Fund) [KRF-2008-331-D00152]
- National Research Foundation of Korea [과C6A1905] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A comb-like copolymer consisting of a poly(vinylidene fluoride-co-chlorotrifluoroethylene) backbone and poly(hydroxy ethyl acrylate) side chains, i.e. P(VDF-co-CTFE)-g-PHEA, was synthesized through atom transfer radical polymerization (ATRP) using CTFE units as a macroinitiator. Successful synthesis and a microphase-separated structure of the copolymer were confirmed by proton nuclear magnetic resonance (H-1 NMR), FT-IR spectroscopy, and transmission electron microscopy (TEM). This comb-like polymer was crosslinked with 4,5-imidazole dicarboxylic acid (IDA) via the esterification of the -OH groups of PHEA and the -COOH groups of IDA. Upon doping with phosphoric acid (H3PO4) to form imidazole-H3PO4 complexes, the proton conductivity of the membranes continuously increased with increasing H3PO4 content. A maximum proton conductivity of 0.015 S/cm was achieved at 120 degrees C under anhydrous conditions. In addition, these P(VDF-co-CTFE)-g-PHEA/IDA/H3PO4 membranes exhibited good mechanical properties (765 MPa of Young's modulus), and high thermal stability up to 250 degrees C, as determined by a universal testing machine (UTM) and thermal gravimetric analysis (TGA), respectively. (C) 2008 Elsevier B.V. All rights reserved.
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