Document Type: Research Paper
Radiochemistry Division, RLG, Bhabha Atomic Research Centre, Mumbai, Trombay, Maharashtra, 400085
Ross E Martin Chair in Emerging Technologies Director, Membrane Science, Engineering & Technology (MAST) Center University of Arkansas, Ralph E Martin Department of Chemical Engineering, 1475 W Cato Spring Road, Fayetteville, AR 72701, USA
The investigation demonstrates the spatial control of the grafting on external versus internal pore surface of regenerated cellulose (RC) ultra-filtration (UF) membrane by glycidyl methachrylate (GMA) using activator generated electron transfer (AGET) atom transfer radical polymerization (ATRP). This controlled polymerization results epoxy functionalized polymer brush ends, which is a suitable platform to induce desired functionalities either by electrophilic or nucleophilic epoxy ring opening. The selectivity in grafting location was induced by using appropriate pore filling solvents prior to the modification. Highly viscous and totally immiscible pore filling solvent was found to have preference of surface grafting compared to the grafting inside the pores. These facts were confirmed by the membrane performance in terms of water permeability and protein rejection.