首页|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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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.

Anion exchange membranePolyvinylidene difluorideElectrodialysisSemi-interpenetrating polymer networks

Aijie Li、Zhanliang Wang、Zhihao Si、Lu Lu、Peipei Huang、Jinhong Liu、Songyuan Yao、Peiyong Qin、Xinmiao Zhang

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National Energy R&D Center for Biorefinery,College of Life Science and Technology,Beijing University of Chemical Technology,Beijing 100029,China

Paris Curie Engineer School,Beijing University of Chemical Technology,Beijing 100029,China

Environmental Protection Research Institute,Beijing Research Institute of Chemical Industry,Beijing 100000,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaBeijing Municipal Science and Technology Planning ProjectBingtuan Science and Technology ProgramBeijing Natural Science FoundationSinopec Grouplongterm from the Ministry of Finance and the Ministry of Education of PRC

2227802322208010Z2211000027220022022DB0252222015323034

2024

10.1016/j.cjche.2024.04.026

中国化学工程学报(英文版)
中国化工学会

中国化学工程学报(英文版)

CSTPCDEI
影响因子：0.818
ISSN：1004-9541
年,卷(期)：2024.72(8)