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Stable crosslinked vinyl‐addition‐type polynorbornene graft copolymer proton‐exchange membranes
Author(s) -
Liu Shufang,
Chen Yiwang,
He Xiaohui,
Chen Lie,
Zhou Weihua
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.33638
Subject(s) - copolymer , polymer chemistry , membrane , materials science , norbornene , thermal stability , methacrylate , atom transfer radical polymerization , monomer , polymerization , methyl methacrylate , condensation polymer , polymer , composite material , chemistry , organic chemistry , biochemistry
The graft copolymer poly(butoxymethylene norbornene‐ co ‐norbornenemethylene bromoisobutyrylate) [P(BN/NB)]‐ graft ‐poly(hydroxyethyl methacrylate) (PHEMA) was synthesized by the atom transfer radical polymerization of 2‐hydroxyethyl methacrylate from a copolymer prepared by two functional norbornene monomers via a vinyl addition mechanism. The graft copolymer P(BN/NB)‐ g ‐PHEMA was further crosslinked with 4,5‐imidazole dicarboxylic acid (IDA) and then doped with phosphoric acid (H 3 PO 4 ) to form imidazole–H 3 PO 4 complexes. The results show that the polynorbornene backbone and crosslinked micromorphology produced low methanol permeability in the membranes (from 1.5 × 10 −7 to 3.8 × 10 −6 cm 2 /s) and endowed the membranes with good mechanical properties (with elastic modulus values of 692.7 to 159.7 MPa, elongation at break values from 2.7 to 22.7%, and tensile strength at break values from 14.4 to 5.5 MPa) and excellent thermal stability (up to 280°C). Furthermore, the proton conductivities of the membranes increased with increasing temperature and increasing content of IDA/H 3 PO 4 in the membranes. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011