N-Methylquinuclidinium versus N,N-Dimethylpiperidinium Cations on Flexible Side Chains in Anion Exchange Membranes
Chen, Si LU ; Luong, Triet Nguyen Dai LU and Jannasch, Patric LU
(2025)
In ACS Materials Au
- Abstract
- The conductivity and stability of anion exchange membranes (AEMs) may be significantly enhanced by attaching the cations to the polymer backbones via flexible side chains. Here, we have tethered polydimethylfluorene with the bicyclic “cage-like” N-methylquinuclidinium (PdF-Qui) and the monocyclic N,N-dimethylpiperidinium (PdF-Pip) cations, respectively, via flexible side chains and studied key AEM properties. Morphological investigations revealed efficient ion clustering in both AEMs, with OH– conductivities exceeding 120 mS cm-¹ at 80 °C. Alkaline stability studies showed no ionic loss or structural changes of PdF-Qui after storage in 5 M aqueous NaOH solution at 90 °C for 360 h. In contrast, the... (More)
- The conductivity and stability of anion exchange membranes (AEMs) may be significantly enhanced by attaching the cations to the polymer backbones via flexible side chains. Here, we have tethered polydimethylfluorene with the bicyclic “cage-like” N-methylquinuclidinium (PdF-Qui) and the monocyclic N,N-dimethylpiperidinium (PdF-Pip) cations, respectively, via flexible side chains and studied key AEM properties. Morphological investigations revealed efficient ion clustering in both AEMs, with OH– conductivities exceeding 120 mS cm-¹ at 80 °C. Alkaline stability studies showed no ionic loss or structural changes of PdF-Qui after storage in 5 M aqueous NaOH solution at 90 °C for 360 h. In contrast, the benchmark PdF-Pip suffered a 7% loss under the same conditions, primarily via Hofmann elimination. This work presents an efficient synthetic strategy to tether N-methylquinuclidinium cations to polymers for AEMs combining outstanding alkaline stability, efficient ionic clustering, and high OH– conductivity.
(Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/60b4ff2d-9f05-4d90-8ea9-62aaa7278ce5
- author
- Chen, Si
LU
; Luong, Triet Nguyen Dai
LU
and Jannasch, Patric
LU
- organization
- publishing date
- 2025
- type
- Contribution to journal
- publication status
- epub
- subject
- in
- ACS Materials Au
- publisher
- The American Chemical Society (ACS)
- ISSN
- 2694-2461
- DOI
- 10.1021/acsmaterialsau.5c00168
- language
- English
- LU publication?
- yes
- id
- 60b4ff2d-9f05-4d90-8ea9-62aaa7278ce5
- date added to LUP
- 2025-03-18 20:27:54
- date last changed
- 2025-11-06 14:03:33
@article{60b4ff2d-9f05-4d90-8ea9-62aaa7278ce5,
abstract = {{The conductivity and stability of anion exchange membranes (AEMs) may be significantly enhanced by attaching the cations to the polymer backbones via flexible side chains. Here, we have tethered polydimethylfluorene with the bicyclic “cage-like” <i>N</i>-methylquinuclidinium (PdF-Qui) and the monocyclic <i>N,N</i>-dimethylpiperidinium (PdF-Pip) cations, respectively, via flexible side chains and studied key AEM properties. Morphological investigations revealed efficient ion clustering in both AEMs, with OH<sup>–</sup> conductivities exceeding 120 mS cm<sup>-</sup>¹ at 80 °C. Alkaline stability studies showed no ionic loss or structural changes of PdF-Qui after storage in 5 M aqueous NaOH solution at 90 °C for 360 h. In contrast, the benchmark PdF-Pip suffered a 7% loss under the same conditions, primarily via Hofmann elimination. This work presents an efficient synthetic strategy to tether <i>N</i>-methylquinuclidinium cations to polymers for AEMs combining outstanding alkaline stability, efficient ionic clustering, and high OH<sup>–</sup> conductivity.<br/><br/>}},
author = {{Chen, Si and Luong, Triet Nguyen Dai and Jannasch, Patric}},
issn = {{2694-2461}},
language = {{eng}},
publisher = {{The American Chemical Society (ACS)}},
series = {{ACS Materials Au}},
title = {{<i>N</i>-Methylquinuclidinium versus <i>N,N</i>-Dimethylpiperidinium Cations on Flexible Side Chains in Anion Exchange Membranes}},
url = {{http://dx.doi.org/10.1021/acsmaterialsau.5c00168}},
doi = {{10.1021/acsmaterialsau.5c00168}},
year = {{2025}},
}