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Multiblock copolymers with highly sulfonated blocks containing di- and tetrasulfonated arylene sulfone segments for proton-exchange membrane fuel cell applications

Takamuku, Shogo LU and Jannasch, Patric LU (2012) In Advanced Energy Materials 2(1). p.129-140
Abstract
Multiblock copoly(arylene ether sulfone)s with different block lengths and ionic contents are tailored for highly stable and proton conducting electrolyte membranes. Two series of fully aromatic copolymers are prepared by coupling reactions between non-sulfonated hydrophobic precursor blocks and highly sulfonated hydrophilic precursor blocks containing either fully disulfonated diarylsulfone or fully tetrasulfonated tetraaryldisulfone segments. The sulfonic acid groups are exclusively introduced in ortho positions to the sulfone bridges to impede desulfonation reactions, and give the blocks ion exchange capacities (IECs) of 4.1 and 4.6 meq./g, respectively. Solvent cast block copolymer membranes show well-connected hydrophilic nanophase... (More)
Multiblock copoly(arylene ether sulfone)s with different block lengths and ionic contents are tailored for highly stable and proton conducting electrolyte membranes. Two series of fully aromatic copolymers are prepared by coupling reactions between non-sulfonated hydrophobic precursor blocks and highly sulfonated hydrophilic precursor blocks containing either fully disulfonated diarylsulfone or fully tetrasulfonated tetraaryldisulfone segments. The sulfonic acid groups are exclusively introduced in ortho positions to the sulfone bridges to impede desulfonation reactions, and give the blocks ion exchange capacities (IECs) of 4.1 and 4.6 meq./g, respectively. Solvent cast block copolymer membranes show well-connected hydrophilic nanophase domains for proton transport and high decomposition temperatures above 310 ˚C under air. Despite higher IEC values, membranes containing tetrasulfonated tetraaryldisulfone segments display a markedly lower water uptake than the corresponding ones with disulfonated diarylsulfone segments when immersed in water at 100 ˚C, presumably because of the much higher chain stiffness and glass transition temperature of the former segments. The former membranes have proton conductivities in level of a perfluorosulfonic acid membrane (NRE212) under fully humidified conditions. A membrane with an IEC of 1.83 meq./g reaches above 6 mS/cm under 30% relative humidity at 80 ˚C, to be compared with 10 mS/cm for NRE212 under the same conditions. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ionomer, block copolymer, polyelectrolyte, sulfonation, polycondensation, water transport, fuel cell membrane
in
Advanced Energy Materials
volume
2
issue
1
pages
129 - 140
publisher
Wiley-Blackwell
external identifiers
  • wos:000298982500018
  • scopus:84859763494
ISSN
1614-6832
DOI
10.1002/aenm.201100515
language
English
LU publication?
yes
id
3fdb8b6c-e366-4e04-80eb-cc672a321dcc (old id 2171969)
date added to LUP
2011-10-11 15:06:30
date last changed
2017-09-10 03:00:08
@article{3fdb8b6c-e366-4e04-80eb-cc672a321dcc,
  abstract     = {Multiblock copoly(arylene ether sulfone)s with different block lengths and ionic contents are tailored for highly stable and proton conducting electrolyte membranes. Two series of fully aromatic copolymers are prepared by coupling reactions between non-sulfonated hydrophobic precursor blocks and highly sulfonated hydrophilic precursor blocks containing either fully disulfonated diarylsulfone or fully tetrasulfonated tetraaryldisulfone segments. The sulfonic acid groups are exclusively introduced in ortho positions to the sulfone bridges to impede desulfonation reactions, and give the blocks ion exchange capacities (IECs) of 4.1 and 4.6 meq./g, respectively. Solvent cast block copolymer membranes show well-connected hydrophilic nanophase domains for proton transport and high decomposition temperatures above 310 ˚C under air. Despite higher IEC values, membranes containing tetrasulfonated tetraaryldisulfone segments display a markedly lower water uptake than the corresponding ones with disulfonated diarylsulfone segments when immersed in water at 100 ˚C, presumably because of the much higher chain stiffness and glass transition temperature of the former segments. The former membranes have proton conductivities in level of a perfluorosulfonic acid membrane (NRE212) under fully humidified conditions. A membrane with an IEC of 1.83 meq./g reaches above 6 mS/cm under 30% relative humidity at 80 ˚C, to be compared with 10 mS/cm for NRE212 under the same conditions.},
  author       = {Takamuku, Shogo and Jannasch, Patric},
  issn         = {1614-6832},
  keyword      = {ionomer,block copolymer,polyelectrolyte,sulfonation,polycondensation,water transport,fuel cell membrane},
  language     = {eng},
  number       = {1},
  pages        = {129--140},
  publisher    = {Wiley-Blackwell},
  series       = {Advanced Energy Materials},
  title        = {Multiblock copolymers with highly sulfonated blocks containing di- and tetrasulfonated arylene sulfone segments for proton-exchange membrane fuel cell applications},
  url          = {http://dx.doi.org/10.1002/aenm.201100515},
  volume       = {2},
  year         = {2012},
}