Anionic quaternary ammonium fluorous copolymers bearing thermo-responsive grafts for fuel cells

Fluorous copolymers are synthesized by grafting quaternary ammonium-functionalized 4-vinylbenzyl chloride (QVBC) and N-Isopropyl acrylamide (NIPAAM) from poly(vinylidene fluoride) (PVDF) via atom transfer radical polymerization (ATRP). Ionic PQVBC and thermo-responsive PNIPAAM grafts are characteriz...

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Bibliographic Details
Published in:International journal of hydrogen energy 2014-06, Vol.39 (17), p.9387-9396
Main Authors: LIANG WU, CHUANRUN LI, ZHEN TAO, HAO WANG, JIN RAN, BAKANGURA, Erigene, ZHENGHUI ZHANG, TONGWEN XU
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Bearing
Clusters
Conductivity
Copolymers
Energy
Exact sciences and technology
Fuels
Grafts
Hydrogen
Hydroxides
Nuclear magnetic resonance
Swelling
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Summary:Fluorous copolymers are synthesized by grafting quaternary ammonium-functionalized 4-vinylbenzyl chloride (QVBC) and N-Isopropyl acrylamide (NIPAAM) from poly(vinylidene fluoride) (PVDF) via atom transfer radical polymerization (ATRP). Ionic PQVBC and thermo-responsive PNIPAAM grafts are characterized by proton nuclear magnetic resonance ( super(1)H NMR) spectroscopy. Polarity difference between flexible grafts and rigid fluorous backbones allows convenient formation of ionic clusters, which impart resultant membranes excellent hydroxide conductivities in the range of 21-52 mS cm super(-1) at 20 degree C, and up to 98 mS cm super(-1) at 70 degree C. Moreover, amide-amide interactions between thermo-responsive grafts at high temperature can mitigate water swelling of hydrophilic clusters. This study suggests that the fluorous copolymer bearing both ionic and thermo-responsive grafts holds a promising selectivity as novel materials for anion exchange membrane with enhanced hydroxide conductivity and controlled water swelling.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2014.04.070