Preparation and properties of PEI crosslinked PECH/nylon composite anion exchange membrane
(2.Department of Chemical Engineering and Safety, Binzhou University, Binzhou, Shandong, China 256600)
(3.Center of Membrane Science and Water Technology, Zhejiang University of Technology, Hangzhou, Zhejiang, China 310014)
【Abstract】Polyepichlorohydrin (PECH) is a linear polymer with good stability and membrane-forming properties, and the use of PECH as a matrix to prepare anion exchange membrane can avoid the use of carcinogenic substances chloromethyl ether and bis(chloromethyl) ether. However, the prepared membrane with PECH as matrix has the disadvantages of poor mechanical strength and high water absorption, which limit its wide application in electrodialysis technology. Crosslinking reaction of PECH was carried out by using polyethyleneimine (PEI) as crosslinking agent, and a network structure was formed therein to limit the excessive swelling of the polymer membrane in water, thus to enhance the mechanical strength of the membrane. The nylon mesh was introduced to further improve the mechanical properties of the membrane. In the present work, the QCPECH/nylon composite anion exchange membrane was prepared. The effects of water uptake, swelling degree, ion exchange capacity, mechanical strength, membrane resistance and desalination on the composite anion exchange membrane were investigated. The results showed that the desalination efficiency (94.8%) of the prepared P1 membrane was higher than that of the commercial membrane (92.4%). It can be seen that the composite anion exchange membrane made of PECH/nylon crosslinked with PEI has the potential for development in electrodialysis desalination.
【Keywords】 anion exchange membrane; cross-linked; polyepichlorohydrin (PECH); electrodialysis; desalination;
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