4-ビニルピリジン-塩化ビニリデン共重合体の逆浸透膜特性

概要

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The characteristics of the membranes of copolymer of 4-vinyl pyridine and vinylidene chloride were investigated with reference to the structure change. The copolymer was spontaneously discolored and insolubilized within several days with elimination of hydrogen chloride. This change could be prevented by storing the copolymer in chloroform solution in cool. The membrane of the copolymer showed higher tensile strength than that of cellulose acetate membrane. With increasing 4VP content in the copolymer water permeability K1 increased, the strength decreased, and NaCl rejection increased passing a maximum at about 65mol% 4VP. Addition of 1, 4-diiodobutane (DIB) to the casting solution, increase in 4VP content and increase in drying time gave enhanced dehydrochlorination. However, quaternized and crosslinked membranes with a small amount of DIB showed improved properties; enhanced K1 and R without considerable decrease in the strength. Dehydrochlorination concurrently brought about the formation of C=C bonds and crosslinking, causing rigid membranes and hence improved K1.