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N-Spirocyclic quaternary ammonium ionenes for anion-exchange membranes

Pham, Thanh Huong LU ; Olsson, Joel S. LU and Jannasch, Patric LU (2017) In Journal of the American Chemical Society 139(8). p.2888-2891
Abstract
The development of cationic polymers for anion-exchange membranes (AEMs) with high alkaline stability and conductivity is a considerable challenge in materials chemistry. In response, we here present the synthesis and properties of N-spirocyclic quaternary ammonium ionenes (spiro-ionenes) containing 5- and 6-membered rings fused by central nitrogen cations. High-molecular weight and film-forming spiro-ionenes are successfully synthesized in cyclo-polycondensations of tetrakis(bromomethyl)benzene and dipiperidines under mild conditions. These polyelectrolytes show excellent thermal and alkaline stability with no degradation detected by NMR spectroscopy after more than 1800 h in 1 M KOD/D2O at 80 °C. Even at 120 °C, the... (More)
The development of cationic polymers for anion-exchange membranes (AEMs) with high alkaline stability and conductivity is a considerable challenge in materials chemistry. In response, we here present the synthesis and properties of N-spirocyclic quaternary ammonium ionenes (spiro-ionenes) containing 5- and 6-membered rings fused by central nitrogen cations. High-molecular weight and film-forming spiro-ionenes are successfully synthesized in cyclo-polycondensations of tetrakis(bromomethyl)benzene and dipiperidines under mild conditions. These polyelectrolytes show excellent thermal and alkaline stability with no degradation detected by NMR spectroscopy after more than 1800 h in 1 M KOD/D2O at 80 °C. Even at 120 °C, the spiro-ionenes display reasonable alkaline stability. Transparent and mechanically robust AEMs based on ionically crosslinked blends of spiro-ionene and polybenzimidazole reach OH conductivities up to 0.12 S cm-1 at 90 °C. The current findings demonstrate that spiro-ionenes constitute a new class of alkali-stable anion-exchange polymers and membranes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of the American Chemical Society
volume
139
issue
8
pages
2888 - 2891
publisher
The American Chemical Society
external identifiers
  • scopus:85014141579
  • wos:000395493400008
ISSN
1520-5126
DOI
10.1021/jacs.6b12944
language
English
LU publication?
yes
id
8874dbd4-c47a-4153-a53d-9d2580da70a1
date added to LUP
2017-02-14 05:44:16
date last changed
2018-11-04 04:26:20
@article{8874dbd4-c47a-4153-a53d-9d2580da70a1,
  abstract     = {The development of cationic polymers for anion-exchange membranes (AEMs) with high alkaline stability and conductivity is a considerable challenge in materials chemistry. In response, we here present the synthesis and properties of <i>N</i>-spirocyclic quaternary ammonium ionenes (spiro-ionenes) containing 5- and 6-membered rings fused by central nitrogen cations. High-molecular weight and film-forming spiro-ionenes are successfully synthesized in cyclo-polycondensations of tetrakis(bromomethyl)benzene and dipiperidines under mild conditions. These polyelectrolytes show excellent thermal and alkaline stability with no degradation detected by NMR spectroscopy after more than 1800 h in 1 M KOD/D<sub>2</sub>O at 80 °C. Even at 120 °C, the spiro-ionenes display reasonable alkaline stability. Transparent and mechanically robust AEMs based on ionically crosslinked blends of spiro-ionene and polybenzimidazole reach OH<sup>–</sup> conductivities up to 0.12 S cm<sup>-1</sup> at 90 °C. The current findings demonstrate that spiro-ionenes constitute a new class of alkali-stable anion-exchange polymers and membranes.},
  author       = {Pham, Thanh Huong and Olsson, Joel S. and Jannasch, Patric},
  issn         = {1520-5126},
  language     = {eng},
  number       = {8},
  pages        = {2888--2891},
  publisher    = {The American Chemical Society},
  series       = {Journal of the American Chemical Society},
  title        = {<i>N</i>-Spirocyclic quaternary ammonium ionenes for anion-exchange membranes},
  url          = {http://dx.doi.org/10.1021/jacs.6b12944},
  volume       = {139},
  year         = {2017},
}