Anion exchange membranes with a semi-interpenetrating polymer network using 1,6-dibromohexane as bifunctional crosslinker

doi:10.1016/j.cjche.2024.04.026

中国化学工程学报 ›› 2024, Vol. 72 ›› Issue (8): 199-208.DOI: 10.1016/j.cjche.2024.04.026

Anion exchange membranes with a semi-interpenetrating polymer network using 1,6-dibromohexane as bifunctional crosslinker

Aijie Li¹, Zhanliang Wang¹, Zhihao Si¹, Lu Lu², Peipei Huang¹, Jinhong Liu¹, Songyuan Yao¹, Peiyong Qin¹, Xinmiao Zhang³

1 National Energy R&D Center for Biorefinery, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China;
2 Paris Curie Engineer School, Beijing University of Chemical Technology, Beijing 100029, China;
3 Environmental Protection Research Institute, Beijing Research Institute of Chemical Industry, Beijing 100000, China

收稿日期:2023-12-20 修回日期:2024-04-12 出版日期:2024-08-28 发布日期:2024-10-17
通讯作者: Peiyong Qin,E-mail:qinpeiyong@tsinghua.org.cn;Xinmiao Zhang,E-mail:zhangxm.bjhy@sinopec.com
基金资助:
This work was funded by National Natural Science Foundation of China (22278023, 22208010), Beijing Municipal Science and Technology Planning Project (Z221100002722002), Bingtuan Science and Technology Program (2022DB025), Beijing Natural Science Foundation (2222015), Sinopec Group (323034) and the long-term from the Ministry of Finance and the Ministry of Education of PRC.

Anion exchange membranes with a semi-interpenetrating polymer network using 1,6-dibromohexane as bifunctional crosslinker

Aijie Li¹, Zhanliang Wang¹, Zhihao Si¹, Lu Lu², Peipei Huang¹, Jinhong Liu¹, Songyuan Yao¹, Peiyong Qin¹, Xinmiao Zhang³

1 National Energy R&D Center for Biorefinery, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China;
2 Paris Curie Engineer School, Beijing University of Chemical Technology, Beijing 100029, China;
3 Environmental Protection Research Institute, Beijing Research Institute of Chemical Industry, Beijing 100000, China

Received:2023-12-20 Revised:2024-04-12 Online:2024-08-28 Published:2024-10-17
Contact: Peiyong Qin,E-mail:qinpeiyong@tsinghua.org.cn;Xinmiao Zhang,E-mail:zhangxm.bjhy@sinopec.com
Supported by:
This work was funded by National Natural Science Foundation of China (22278023, 22208010), Beijing Municipal Science and Technology Planning Project (Z221100002722002), Bingtuan Science and Technology Program (2022DB025), Beijing Natural Science Foundation (2222015), Sinopec Group (323034) and the long-term from the Ministry of Finance and the Ministry of Education of PRC.

摘要/Abstract

摘要： An anion exchange membrane (AEM) is generally expected to possess high ion exchange capacity (IEC), low water uptake (WU), and high mechanical strength when applied to electrodialysis desalination. Among different types of AEMs, semi-interpenetrating polymer networks (SIPNs) have been suggested for their structural superiorities, i.e., the tunable local density of ion exchange groups for IEC and the restrained leaching of hygroscopic groups by insolubility for WU. Unfortunately, the conventional SIPN AEMs still struggle to balances IEC, WU, and mechanical strength simultaneously, due to the lack of the compact crosslinking region. In this work, we proposed a novel SIPN structure of polyvinylidene difluoride/polyvinylimidazole/1,6-dibromohexane (PVDF/PVIm/DBH). On the one hand, DBH with two cationic groups of imidazole groups are introduced to enhance the ion conductivity, which is different from the conventional monofunctional modifier with only one cationic group. On the other hand, DBH has the ability to bridge with PVIm, where the mechanical strength of the resulting AEM is increased by the increase of crosslinking degree. Results show that a low WU of 38.1% to 62.6%, high IEC of 2.12-2.22 mmol·g^-1, and excellent tensile strength of 3.54-12.35 MPa for PVDF/PVIm/DBH membrane are achieved. This work opens a new avenue for achieving the high-quality AEMs.

关键词: Anion exchange membrane, Polyvinylidene difluoride, Electrodialysis, Semi-interpenetrating polymer networks

Abstract: An anion exchange membrane (AEM) is generally expected to possess high ion exchange capacity (IEC), low water uptake (WU), and high mechanical strength when applied to electrodialysis desalination. Among different types of AEMs, semi-interpenetrating polymer networks (SIPNs) have been suggested for their structural superiorities, i.e., the tunable local density of ion exchange groups for IEC and the restrained leaching of hygroscopic groups by insolubility for WU. Unfortunately, the conventional SIPN AEMs still struggle to balances IEC, WU, and mechanical strength simultaneously, due to the lack of the compact crosslinking region. In this work, we proposed a novel SIPN structure of polyvinylidene difluoride/polyvinylimidazole/1,6-dibromohexane (PVDF/PVIm/DBH). On the one hand, DBH with two cationic groups of imidazole groups are introduced to enhance the ion conductivity, which is different from the conventional monofunctional modifier with only one cationic group. On the other hand, DBH has the ability to bridge with PVIm, where the mechanical strength of the resulting AEM is increased by the increase of crosslinking degree. Results show that a low WU of 38.1% to 62.6%, high IEC of 2.12-2.22 mmol·g^-1, and excellent tensile strength of 3.54-12.35 MPa for PVDF/PVIm/DBH membrane are achieved. This work opens a new avenue for achieving the high-quality AEMs.

Key words: Anion exchange membrane, Polyvinylidene difluoride, Electrodialysis, Semi-interpenetrating polymer networks

Aijie Li, Zhanliang Wang, Zhihao Si, Lu Lu, Peipei Huang, Jinhong Liu, Songyuan Yao, Peiyong Qin, Xinmiao Zhang. Anion exchange membranes with a semi-interpenetrating polymer network using 1,6-dibromohexane as bifunctional crosslinker[J]. 中国化学工程学报, 2024, 72(8): 199-208.

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Anion exchange membranes with a semi-interpenetrating polymer network using 1,6-dibromohexane as bifunctional crosslinker

Anion exchange membranes with a semi-interpenetrating polymer network using 1,6-dibromohexane as bifunctional crosslinker

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