Salt and Seawater Science & Technology
Online ISSN : 2435-4619
Preparation of Crosslinked Cation-exchange Membranes by Sulfonation of Polymer Chains Cografted with St and CMS
Takeshi NAGATANI Takaaki SASAKIKyoichi SAITO
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ジャーナル フリー

2021 年 2 巻 p. 22-28

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Cation-exchange membranes with improved electrodialysis and mechanical strength for manufacturing edible salt were prepared by electron-beam-induced graft polymerization. First, styrene (St) and chloromethyl styrene (CMS) were co-grafted onto an EB-irradiated ultra-high molecular weight polyethylene film. Second, through a reaction with chlorosulfonic acid, a sulfonic acid group was introduced while incorporating the crosslinked structure into the cograft chains. The cation-exchange membranes that were prepared with various CMS contents in a vinyl monomer solution were stored in 0.5 mol/L NaCl at 25 ° C to evaluate the time course of the water content, membrane resistance, and tensile strength. Over a 150-day storage period, the water content increased and the membrane resistance and tensile strength decreased. This tendency can be explained by the fact that the cograft chains are crosslinked to depress water inclusion in the sulfonic acid group containing a polymer network. The CMS content in the vinyl monomer solution governed the degree of crosslinking of the polymer network of the membrane, affecting the performance of the electrodialysis. The cation-exchange membrane, prepared at a CMS content of 17 % and a degree of cografting of 74 %, exhibited 20 % higher chloride ion concentration of brine for the electrodialysis compared with a commercially available cation-exchange membrane.

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© 2021 The Society of Sea Water Science, Japan
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