Abstract
The pH-dependent change of the pore size of poly(acrylic acid)-grafted, straight pored polycarbonate membrane was investigated. Peroxide groups were generated on the surface of the polycarbonate membrane by glow discharge, and the membrane was heated in the aqueous solution of acrylic acid to initiate the graft copolymerization. The density and the length of graft chains were dependent on the conditions in the glow-discharge treatment and the monomer concentration in the graft copolymerization, respectively. The water permeability to the poly(acrylic acid)-grafted membrane increased sharply in pH regions below 4, representing the expansion of pores. However, very high densities of graft chains or very long graft chains restricted the mobility of poly(acrylic acid) chains, and the pore size became pH-independent.
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