Abstract

A straight-pored membrane, which controls the rate of water permeation according to pH and ionic strength, was synthesized by surface-graft polymerization of vinyl monomers carrying a carboxylic acid substituent. The rate of water permeation through the prepared membrane changed reversibly in response to pH variation of the aqueous solution. The pH response of water permeation was controlled by changing the density and length of graft chains. The most sensitive pH response was attained with a membrane having poly(carboxylic acid) of a high degree of polymerization grafted in low densities

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