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摘要
This work studied the surface modification of poly(vinylidene fluoride) (PVDF) membranes by coating poly(3,4-dihydroxyphenylalanine) (polyDOPA) for the purpose of an investigation on the antifouling ability. In mild alkaline environments, both oxidized and deoxidized 3,4-dihydroxy-L-phenylalanine were able to self-polymerize and form a polyDOPA coating attached firmly onto PVDF membrane surfaces. The membrane hydrophilicity was evaluated by water intake and water contact angle measurements. The oxidized and deoxidized polyDOPA-coated modified membranes displayed substantial resistance to bovine serum albumin fouling compared with pure PVDF. The chemical compositions of modified membrane surfaces were determined by fourier transform infrared spectrometer analysis and X-ray photoelectron spectroscopy. Morphological changes of membrane surfaces were detected by using scanning electron microscopy. The coating durability experience was carried out in acid and base solutions at pH 1.45, 4.75, 9.25, and 11.5, respectively. The antifouling effect of deoxidative polyDOPA-coated membranes keeping wet was better than that of oxidized PolyDOPA-coated membranes due to the presence of phenolic hydroxyl groups except in strong base solution and dry environment.
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