Volume 121, Issue 2 pp. 1166-1175

Stable crosslinked vinyl-addition-type polynorbornene graft copolymer proton-exchange membranes

Shufang Liu

Shufang Liu

Institute of Polymers/Institute for Advanced Study, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China

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Yiwang Chen

Corresponding Author

Yiwang Chen

Institute of Polymers/Institute for Advanced Study, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China

Institute of Polymers/Institute for Advanced Study, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China===Search for more papers by this author
Xiaohui He

Corresponding Author

Xiaohui He

Institute of Polymers/Institute for Advanced Study, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China

Institute of Polymers/Institute for Advanced Study, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China===Search for more papers by this author
Lie Chen

Corresponding Author

Lie Chen

Institute of Polymers/Institute for Advanced Study, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China

Institute of Polymers/Institute for Advanced Study, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China===Search for more papers by this author
Weihua Zhou

Weihua Zhou

Institute of Polymers/Institute for Advanced Study, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China

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First published: 28 February 2011
Citations: 17

Abstract

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 (H3PO4) to form imidazole–H3PO4 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 cm2/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/H3PO4 in the membranes. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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