Polyfluorenes Bearing N,N-Dimethylpiperidinium Cations on Short Spacers for Durable Anion Exchange Membranes
Allushi, Andrit LU ; Mansouri Bakvand, Pegah LU and Jannasch, Patric LU
(2023)
In Macromolecules
56(3).
p.1165-1176
- Abstract
- Alicyclic quaternary ammonium cations having all the β-protons in a strain-free ring structure are in general highly base resistant, and are thus very attractive to employ for anion exchange membrane (AEM) applications. However, tethering cations such as N,N-dimethylpiperidinium (DMP) to polymer backbones without introducing any weak links is quite challenging. In the present study, we have attached pairs of piperidine rings in their 4-position to fluorene and 2,7-diphenylfluorene via methylene bridges using straightforward SN2 reactions. These fluorenes were subsequently utilized as monomers in polyhydroxyalkylations to prepare poly(fluorene alkylene)s with different contents of the piperidine groups. AEMs were... (More)
- Alicyclic quaternary ammonium cations having all the β-protons in a strain-free ring structure are in general highly base resistant, and are thus very attractive to employ for anion exchange membrane (AEM) applications. However, tethering cations such as N,N-dimethylpiperidinium (DMP) to polymer backbones without introducing any weak links is quite challenging. In the present study, we have attached pairs of piperidine rings in their 4-position to fluorene and 2,7-diphenylfluorene via methylene bridges using straightforward SN2 reactions. These fluorenes were subsequently utilized as monomers in polyhydroxyalkylations to prepare poly(fluorene alkylene)s with different contents of the piperidine groups. AEMs were cast after quaternizing the piperidine groups to introduce DMP and spirocyclic 6-azonia-spiro-[5,5]undecane-6-ium (ASU) cations, respectively. The AEMs reached very high hydroxide ion conductivities, 100-156 mS cm-1 at 80 ºC, in the ion exchange capacity (IEC) range 1.8-2.4 mequiv. g-1. X-ray scattering showed ionomer peaks indicating ionic clustering with a characteristic distance d = 2.0-2.9 nm depending on IEC. The AEMs displayed high thermal stability, up to ~250 ºC, and 1H NMR data indicated no degradation after storage in 5 M aq. NaOH during 168 h at 90 ºC. However, degradation started under very severe conditions (10 M, 90 °C) with ~75% of the total ionic loss in all the AEMs assigned to Hofmann β-elimination. The overall results show that fluorene-based AEMs carrying DMP and ASU cations via methylene bridges display an attractive combination of ionic phase separation, thermal and chemical stability, and hydroxide conductivity. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/c9799ffa-2d59-43bd-bbd8-e0289826b2fd
- author
- Allushi, Andrit
LU
; Mansouri Bakvand, Pegah
LU
and Jannasch, Patric
LU
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Macromolecules
- volume
- 56
- issue
- 3
- pages
- 1165 - 1176
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:85146624244
- ISSN
- 0024-9297
- DOI
- 10.1021/acs.macromol.2c02291
- language
- English
- LU publication?
- yes
- id
- c9799ffa-2d59-43bd-bbd8-e0289826b2fd
- date added to LUP
- 2022-12-26 10:05:49
- date last changed
- 2023-11-07 00:59:21
@article{c9799ffa-2d59-43bd-bbd8-e0289826b2fd,
abstract = {{Alicyclic quaternary ammonium cations having all the β-protons in a strain-free ring structure are in general highly base resistant, and are thus very attractive to employ for anion exchange membrane (AEM) applications. However, tethering cations such as <i>N</i>,<i>N</i>-dimethylpiperidinium (DMP) to polymer backbones without introducing any weak links is quite challenging. In the present study, we have attached pairs of piperidine rings in their 4-position to fluorene and 2,7-diphenylfluorene via methylene bridges using straightforward S<sub>N</sub>2 reactions. These fluorenes were subsequently utilized as monomers in polyhydroxyalkylations to prepare poly(fluorene alkylene)s with different contents of the piperidine groups. AEMs were cast after quaternizing the piperidine groups to introduce DMP and spirocyclic 6-azonia-spiro-[5,5]undecane-6-ium (ASU) cations, respectively. The AEMs reached very high hydroxide ion conductivities, 100-156 mS cm<sup>-1</sup> at 80 ºC, in the ion exchange capacity (IEC) range 1.8-2.4 mequiv. g<sup>-1</sup>. X-ray scattering showed ionomer peaks indicating ionic clustering with a characteristic distance <i>d</i> = 2.0-2.9 nm depending on IEC. The AEMs displayed high thermal stability, up to ~250 ºC, and 1H NMR data indicated no degradation after storage in 5 M aq. NaOH during 168 h at 90 ºC. However, degradation started under very severe conditions (10 M, 90 °C) with ~75% of the total ionic loss in all the AEMs assigned to Hofmann β-elimination. The overall results show that fluorene-based AEMs carrying DMP and ASU cations via methylene bridges display an attractive combination of ionic phase separation, thermal and chemical stability, and hydroxide conductivity.}},
author = {{Allushi, Andrit and Mansouri Bakvand, Pegah and Jannasch, Patric}},
issn = {{0024-9297}},
language = {{eng}},
number = {{3}},
pages = {{1165--1176}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Macromolecules}},
title = {{Polyfluorenes Bearing <i>N</i>,<i>N</i>-Dimethylpiperidinium Cations on Short Spacers for Durable Anion Exchange Membranes}},
url = {{http://dx.doi.org/10.1021/acs.macromol.2c02291}},
doi = {{10.1021/acs.macromol.2c02291}},
volume = {{56}},
year = {{2023}},
}