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Proton conducting graft copolymers with tunable length and density of phosphonated side chains for fuel cell membranes

Dimitrov, Ivaylo; Takamuku, Shogo LU ; Jankova, Katja; Jannasch, Patric LU and Hvilsted, Søren (2014) In Journal of Membrane Science 450. p.362-368
Abstract
Polysulfones functionalized with highly phosphonated poly(pentafluorostyrene) side chains of different length were synthesized applying controlled polymerization and modification methods. The graft copolymers' thermal properties were evaluated by differential scanning calorimetry and thermal gravimetrical analyses. The proton conductivity of membrane prepared from the graft copolymer with the shortest phosphonated side chains was 134 mS cm−1 at 100 °C under fully immersed conditions. The graft copolymer TEM image shows a nanophase separation of ion-rich segments within the polysulfone matrix. Increasing the ionic groups content in the graft copolymers led to extensive membrane swelling. To improve the dimensional stability the graft... (More)
Polysulfones functionalized with highly phosphonated poly(pentafluorostyrene) side chains of different length were synthesized applying controlled polymerization and modification methods. The graft copolymers' thermal properties were evaluated by differential scanning calorimetry and thermal gravimetrical analyses. The proton conductivity of membrane prepared from the graft copolymer with the shortest phosphonated side chains was 134 mS cm−1 at 100 °C under fully immersed conditions. The graft copolymer TEM image shows a nanophase separation of ion-rich segments within the polysulfone matrix. Increasing the ionic groups content in the graft copolymers led to extensive membrane swelling. To improve the dimensional stability the graft copolymers were blended with pyridine-modified polysulfone. The blend membranes were transparent with formation of nano-phase domains as revealed from TEM images. The acid-base blend membranes exhibited a slightly higher thermal stability but lower proton conductivity compared to the membranes formed from pure graft copolymers. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Membrane Science
volume
450
pages
362 - 368
publisher
Elsevier
external identifiers
  • wos:000326324600040
  • scopus:84885340354
ISSN
0376-7388
DOI
10.1016/j.memsci.2013.09.016
language
English
LU publication?
yes
id
61f861bc-4bf5-4ef9-bc8a-3e712db6786f (old id 4004986)
alternative location
http://www.sciencedirect.com/science/article/pii/S0376738813007345
date added to LUP
2013-09-13 12:22:32
date last changed
2017-10-01 04:15:43
@article{61f861bc-4bf5-4ef9-bc8a-3e712db6786f,
  abstract     = {Polysulfones functionalized with highly phosphonated poly(pentafluorostyrene) side chains of different length were synthesized applying controlled polymerization and modification methods. The graft copolymers' thermal properties were evaluated by differential scanning calorimetry and thermal gravimetrical analyses. The proton conductivity of membrane prepared from the graft copolymer with the shortest phosphonated side chains was 134 mS cm−1 at 100 °C under fully immersed conditions. The graft copolymer TEM image shows a nanophase separation of ion-rich segments within the polysulfone matrix. Increasing the ionic groups content in the graft copolymers led to extensive membrane swelling. To improve the dimensional stability the graft copolymers were blended with pyridine-modified polysulfone. The blend membranes were transparent with formation of nano-phase domains as revealed from TEM images. The acid-base blend membranes exhibited a slightly higher thermal stability but lower proton conductivity compared to the membranes formed from pure graft copolymers.},
  author       = {Dimitrov, Ivaylo and Takamuku, Shogo and Jankova, Katja and Jannasch, Patric and Hvilsted, Søren},
  issn         = {0376-7388},
  language     = {eng},
  pages        = {362--368},
  publisher    = {Elsevier},
  series       = {Journal of Membrane Science},
  title        = {Proton conducting graft copolymers with tunable length and density of phosphonated side chains for fuel cell membranes},
  url          = {http://dx.doi.org/10.1016/j.memsci.2013.09.016},
  volume       = {450},
  year         = {2014},
}