Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Block copolymers containing intrinsically proton-conducting blocks tethered with benzimidazole units

Persson, Christian LU and Jannasch, Patric LU orcid (2006) In Chemistry of Materials 18(13). p.3096-3102
Abstract
ABA triblock copolymers having benzimidazole-tethered end blocks have been prepared and characterized with respect to their intrinsically proton conducting properties. The copolymers were synthesized by using a linear poly(ethylene oxide) (PEO) as a difunctional macroinitiator for the anionic ring-opening polymerization of allyl glycidyl ether. The pendent allyl groups of the end blocks were subsequently linked with 2-(2-benzimidazolyl)ethanethiol via a free radical thiol-ene coupling reaction. Thermogravimetry showed that the final materials were stable up to 210 C under a nitrogen atmosphere. The benzimidazole units of the copolymers were found to crystallize from solution but not from the melt. After heating the materials above the... (More)
ABA triblock copolymers having benzimidazole-tethered end blocks have been prepared and characterized with respect to their intrinsically proton conducting properties. The copolymers were synthesized by using a linear poly(ethylene oxide) (PEO) as a difunctional macroinitiator for the anionic ring-opening polymerization of allyl glycidyl ether. The pendent allyl groups of the end blocks were subsequently linked with 2-(2-benzimidazolyl)ethanethiol via a free radical thiol-ene coupling reaction. Thermogravimetry showed that the final materials were stable up to 210 C under a nitrogen atmosphere. The benzimidazole units of the copolymers were found to crystallize from solution but not from the melt. After heating the materials above the melting point of benzimidazole units, the copolymers displayed single glass transitions temperatures (Tg's). Moreover, the crystallization of the PEO blocks was depressed which may indicate a high degree of interaction between the dissimilar blocks. The proton conductivity was found to be promoted by a high benzimidazole concentration and a high segmental mobility, that is, low Tg's of the copolymers. Increased concentrations of benzimidazole raised the Tg, and the resulting conductivity thus depended on a balance between the charge carrier density and the mobility. Conductivities close to 80 μS/cm were reached at 160 C by these materials under completely anhydrous conditions. (Less)
Please use this url to cite or link to this publication:
author
and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Chemistry of Materials
volume
18
issue
13
pages
3096 - 3102
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000238386000023
  • scopus:33746369755
ISSN
0897-4756
DOI
10.1021/cm0602848
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Polymer and Materials Chemistry (LTH) (011001041)
id
aa46f011-3756-4c5a-b4e9-8c23f009ac47 (old id 157771)
date added to LUP
2016-04-01 12:13:58
date last changed
2021-10-06 02:41:48
@article{aa46f011-3756-4c5a-b4e9-8c23f009ac47,
  abstract     = {ABA triblock copolymers having benzimidazole-tethered end blocks have been prepared and characterized with respect to their intrinsically proton conducting properties. The copolymers were synthesized by using a linear poly(ethylene oxide) (PEO) as a difunctional macroinitiator for the anionic ring-opening polymerization of allyl glycidyl ether. The pendent allyl groups of the end blocks were subsequently linked with 2-(2-benzimidazolyl)ethanethiol via a free radical thiol-ene coupling reaction. Thermogravimetry showed that the final materials were stable up to 210 C under a nitrogen atmosphere. The benzimidazole units of the copolymers were found to crystallize from solution but not from the melt. After heating the materials above the melting point of benzimidazole units, the copolymers displayed single glass transitions temperatures (Tg's). Moreover, the crystallization of the PEO blocks was depressed which may indicate a high degree of interaction between the dissimilar blocks. The proton conductivity was found to be promoted by a high benzimidazole concentration and a high segmental mobility, that is, low Tg's of the copolymers. Increased concentrations of benzimidazole raised the Tg, and the resulting conductivity thus depended on a balance between the charge carrier density and the mobility. Conductivities close to 80 μS/cm were reached at 160 C by these materials under completely anhydrous conditions.},
  author       = {Persson, Christian and Jannasch, Patric},
  issn         = {0897-4756},
  language     = {eng},
  number       = {13},
  pages        = {3096--3102},
  publisher    = {The American Chemical Society (ACS)},
  series       = {Chemistry of Materials},
  title        = {Block copolymers containing intrinsically proton-conducting blocks tethered with benzimidazole units},
  url          = {http://dx.doi.org/10.1021/cm0602848},
  doi          = {10.1021/cm0602848},
  volume       = {18},
  year         = {2006},
}