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Locating sulfonic acid groups on various side chains to poly(arylene ether sulfone)s: effects on the ionic clustering and properties of proton-exchange membranes

Persson Jutemar, Elin LU and Jannasch, Patric LU (2010) In Journal of Membrane Science 351(1-2). p.87-95
Abstract
Poly(arylene ether sulfone)s carrying various aromatic mono-, di-, and trisulfonated side´chains have been investigated with respect to their nanoscale structure and key membrane properties. Sulfobenzoyl, sulfonaphthoxybenzoyl, disulfonaphthoxybenzoyl, and trisulfopyrenoxybenzoyl side chains were attached to the poly(arylene ether sulfone) main chain by employing different combinations of metallation and nucleophilic aromatic substitution reactions. The nature of the sulfonated side chains was found to either promote or suppress the formation of ionic clusters, in relation to the ionic clustering occurring in corresponding polymers carrying sulfonic acid groups directly on the main chain. Analysis by small angle X-ray scattering (SAXS) of... (More)
Poly(arylene ether sulfone)s carrying various aromatic mono-, di-, and trisulfonated side´chains have been investigated with respect to their nanoscale structure and key membrane properties. Sulfobenzoyl, sulfonaphthoxybenzoyl, disulfonaphthoxybenzoyl, and trisulfopyrenoxybenzoyl side chains were attached to the poly(arylene ether sulfone) main chain by employing different combinations of metallation and nucleophilic aromatic substitution reactions. The nature of the sulfonated side chains was found to either promote or suppress the formation of ionic clusters, in relation to the ionic clustering occurring in corresponding polymers carrying sulfonic acid groups directly on the main chain. Analysis by small angle X-ray scattering (SAXS) of solvent cast membranes showed that the ionic clustering was promoted by placing the sulfonic acid groups on relatively long sulfonated naphthoxybenzoyl or pyrenoxybenzoyl side chains. This resulted in SAXS profiles that indicated larger characteristic separation lengths and narrower ionomer peaks, as compared with corresponding main-chain sulfonated polymers. On the other hand, the ionic clustering was almost completely suppressed in membranes based on polymers functionalized with short 2-sulfobenzoyl side chains. Proton conductivity measurements at low or moderate water contents showed a trend of increasing conductivities with the length and the sulfonic acid functionality of the side chain. The

structure of the side chain also influenced the thermal stability and glass transition temperature of the membranes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ionomers, polyelectrolytes, proton exchange membrane fuel cells, x-ray scattering, polymer electrolytes
in
Journal of Membrane Science
volume
351
issue
1-2
pages
87 - 95
publisher
Elsevier
external identifiers
  • wos:000276282900013
  • scopus:77549087765
ISSN
0376-7388
DOI
10.1016/j.memsci.2010.01.036
language
English
LU publication?
yes
id
7a2da986-3f34-428a-90f8-a917c0eb584c (old id 1529767)
date added to LUP
2010-02-24 12:33:07
date last changed
2018-05-29 09:46:57
@article{7a2da986-3f34-428a-90f8-a917c0eb584c,
  abstract     = {Poly(arylene ether sulfone)s carrying various aromatic mono-, di-, and trisulfonated side´chains have been investigated with respect to their nanoscale structure and key membrane properties. Sulfobenzoyl, sulfonaphthoxybenzoyl, disulfonaphthoxybenzoyl, and trisulfopyrenoxybenzoyl side chains were attached to the poly(arylene ether sulfone) main chain by employing different combinations of metallation and nucleophilic aromatic substitution reactions. The nature of the sulfonated side chains was found to either promote or suppress the formation of ionic clusters, in relation to the ionic clustering occurring in corresponding polymers carrying sulfonic acid groups directly on the main chain. Analysis by small angle X-ray scattering (SAXS) of solvent cast membranes showed that the ionic clustering was promoted by placing the sulfonic acid groups on relatively long sulfonated naphthoxybenzoyl or pyrenoxybenzoyl side chains. This resulted in SAXS profiles that indicated larger characteristic separation lengths and narrower ionomer peaks, as compared with corresponding main-chain sulfonated polymers. On the other hand, the ionic clustering was almost completely suppressed in membranes based on polymers functionalized with short 2-sulfobenzoyl side chains. Proton conductivity measurements at low or moderate water contents showed a trend of increasing conductivities with the length and the sulfonic acid functionality of the side chain. The<br/><br>
structure of the side chain also influenced the thermal stability and glass transition temperature of the membranes.},
  author       = {Persson Jutemar, Elin and Jannasch, Patric},
  issn         = {0376-7388},
  keyword      = {ionomers,polyelectrolytes,proton exchange membrane fuel cells,x-ray scattering,polymer electrolytes},
  language     = {eng},
  number       = {1-2},
  pages        = {87--95},
  publisher    = {Elsevier},
  series       = {Journal of Membrane Science},
  title        = {Locating sulfonic acid groups on various side chains to poly(arylene ether sulfone)s: effects on the ionic clustering and properties of proton-exchange membranes},
  url          = {http://dx.doi.org/10.1016/j.memsci.2010.01.036},
  volume       = {351},
  year         = {2010},
}