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Synthesis of Proton-conducting Membranes by the Utilization of Preirradiation Grafting and Atom Transfer Radical Polymerization Techniques by Svante Holmberg; Peter Holmlund; Carl-Eric Wilén; Tanja Kallio; Göran Sundholm; Franciska Sundholm is a Materials Science article available to read on EtoBox.

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## Abstract The atom transfer radical polymerization (ATRP) of styrene onto poly(vinylidene fluoride)‐__graft__‐poly(vinylbenzyl chloride) (PVDF‐__g__‐PVBC) membranes was investigated. Novel membranes were designed for fuel‐cell applications. The benzyl chloride groups in the PVDF‐__g__‐PVBC membranes functioned as initiators, and a Cu‐based catalytic system with the general formula Cu(__n__)X~__n__~/ligand [where X is Cl or Br and the ligand is 2,2′‐bipyridyl (bpy)] was employed for the ATRP. In addition, 10 vol % dimethylformamide was added for increased solubility of the catalyst complex in styrene. The system was homogeneous, except for the membrane, when the initiator/copper halide/ligand/monomer molar ratio was 1/1/3/500. As anticipated, the fastest polymerization rate of styrene was observed with the copper bromide/bpy‐based catalyst system. The reaction rate was strongly temperature‐dependent within the studied temperature interval of 100–130 °C. The degree of grafting increased linearly with time, thereby indicating first‐order kinetics, regardless of the polymerization temperature. Furthermore, 120 °C was the maximum polymerization temperature that could be used in practi

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Author

Svante Holmberg; Peter Holmlund; Carl-Eric Wilén; Tanja Kallio; Göran Sundholm; Franciska Sundholm

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0887-624X)

Published

2002

Language

EN

Field

Materials Science (Physical Sciences)