PREPARATION OF SURFACE-MODIFIED STIMULI-RESPONSIVE POLYMERIC MEMBRANES BY PLASMA AND ULTRAVIOLET GRAFTING METHODS AND THEIR RIBOFLAVIN PERMEATION

Acrylic monomers were grafted on the surface of commercial polyamide membranes using plasma polymerization and ultraviolet irradiation techniques. Graft reaction was confirmed by X-ray photoelectron spectra. Grafting yield increased with plasma and ultraviolet exposure time. Permeation of riboflavin through graft membranes was investigated. Poly(acrylic acid-g-amide) membranes showed a decrease in permeability of riboflavin at pH 4-5, while poly(methacrylic acid-g-amide) membranes exhibited decreased permeability at pH 6-7 regardless of the grafting methods. N-isopropylacrylamide-grafted polyamide membrane showed a temperature-dependent permeation of riboflavin.