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

Ingratta, Mark LU ; Elomaa, Matti and Jannasch, Patric LU (2010) In Polymer Chemistry 1(5). p.739-746
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
poly(vinylphosphonic acid), anionic graft polymerizations, polyelectrolytes, grafting, poly(phenylene oxide), polymer electrolyte membrane fuel cells, ionomers
in
Polymer Chemistry
volume
1
issue
5
pages
739 - 746
publisher
Royal Society of Chemistry
external identifiers
  • wos:000279777100023
  • scopus:78649697372
ISSN
1759-9954
DOI
10.1039/b9py00390h
language
English
LU publication?
yes
id
2d5f9003-1ac0-41fe-ae19-e7dc17b4e218 (old id 1554133)
alternative location
http://www.rsc.org/publishing/journals/PY/article.asp?doi=B9PY00390H
date added to LUP
2010-03-11 14:43:28
date last changed
2018-05-29 12:27:39
@article{2d5f9003-1ac0-41fe-ae19-e7dc17b4e218,
  abstract     = {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.},
  author       = {Ingratta, Mark and Elomaa, Matti and Jannasch, Patric},
  issn         = {1759-9954},
  keyword      = {poly(vinylphosphonic acid),anionic graft polymerizations,polyelectrolytes,grafting,poly(phenylene oxide),polymer electrolyte membrane fuel cells,ionomers},
  language     = {eng},
  number       = {5},
  pages        = {739--746},
  publisher    = {Royal Society of Chemistry},
  series       = {Polymer Chemistry},
  title        = {Grafting poly(phenylene oxide) with poly(vinylphosphonic acid) for fuel cell membranes},
  url          = {http://dx.doi.org/10.1039/b9py00390h},
  volume       = {1},
  year         = {2010},
}