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The introduction of functionality into asymmetric polysulfone membranes has widened their applicability. They are modified with acrylic acid with a light‐induced technique. Fourier transform infrared, contact‐angle, porometry, and atomic force microscopy studies have been carried out to characterize the membranes. The performance of the modified membranes has been investigated with permeation measurements. The salt rejection (NaCl and Na2SO4) performance of the modified membranes shows evidence of functionalization on them. The modification of the membranes also develops the retention of small organic molecules (glucose and 2,4‐dichlorophenol). © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007

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ABSTRACT:The study in particular relates to a process for modifying surface of polymeric membrane and their biocidal activities. The modification process is based on absorption of 1, 3, phenylene diamine on the asymmetric polysulfone membrane and its diazo reaction. The azo compound (Bismarck brown) is characterized by LC-mass, uv-vis spectra. The incorporation of azo compound into polysulfone asymmetric membrane is proved by ATR-FTIR, SEM studies. The decrease in contact angle for modified surface proves the development of hydrophilic character. The modified membrane shows higher biocidal activity (for marine bacteria Vibrio sp.) compared to the virgin polysulfone membrane. The biofilm formation is inhibited for the modified membrane compared to virgin Polysulfone membrane.