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Grafting poly(phenylene oxide) with poly(vinylphosphonic acid) for fuel cell membranes

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Author

Summary, in English

Densely phosphonated electrolyte membranes were prepared from poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) grafted with poly(vinylphosphonic acid) (PVPA) side chains. In the first step, PPO was lithiated in solution at room temperature by adding n-butyllithium to form an anionic macroinitiatior. Next, diethyl vinylphosphonate (DEVP) was anionically polymerized from the lithiated sites at -78 °C. This protocol gave good control over the density of the grafting sites and the copolymer composition. Films of copolymers containing between 35 and 74 wt% poly(diethyl vinylphosphonate) were first cast from solution, and subsequently fully hydrolyzed to produce transparent flexible proton conducting membranes of PPO-graft-PVPA containing up to 6 mmol phosphonic acid groups per gram dry copolymer. Thermogravimetric analysis showed anhydride formation at increasing temperatures above 100 °C with no copolymer degradation occurring until nearly 400 °C under air. Fully hydrated membranes reached proton conductivities above 1 mS/cm at -20 °C and 80 mS/cm at 120 °C.

Publishing year

2010

Language

English

Pages

739-746

Publication/Series

Polymer Chemistry

Volume

1

Issue

5

Document type

Journal article

Publisher

Royal Society of Chemistry

Topic

  • Chemical Sciences

Keywords

  • poly(vinylphosphonic acid)
  • anionic graft polymerizations
  • polyelectrolytes
  • grafting
  • poly(phenylene oxide)
  • polymer electrolyte membrane fuel cells
  • ionomers

Status

Published

ISBN/ISSN/Other

  • ISSN: 1759-9954