Abstract
A novel hollow fiber containing phosphoric acid groups was synthesized by radiation-induced graft polymerization of glycidyl methacrylate onto a porous polyethylene hollow fiber, followed by phosphorylation of the epoxide ring with phosphoric acid. The phosphorylated hollow fiber, whose extents of grafting and conversion by phosphorylation were 90% and 54%, respectively, had a total ion-exchange capacity of 1.62 and a salt-splitting capacity of 0.68 mol/kg for the hollow fiber of Na form. Although the permeation flux of the phosphorylated hollow fiber was negligible, cross-linking by irradiation before or after phosphorylation improved the permeation flux up to 0.18 m 3/m 2-hr. The phosphorylated hollow fiber exhibited chemical stability in both acidic and alkaline solutions and high durability over the adsorption-elution cycles.
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