• Uma Vuruputuri

      Articles written in Journal of Chemical Sciences

    • Dye-sensitized photopolymerization of N,N′-methylenebisacrylamide by initiation with eosin-ascorbic acid system

      Parthasarathy Tigulla Uma Vuruputuri

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      The dye-sensitized photopolymerization of N,N′-methylenebisacrylamide (MBA) in aqueous medium initiated by eosin-ascorbic acid (AH2) was studied at 25°C. The polymerization takes place only at higher concentration of AH2 (> 10−3 mol/L) and its rate increases rapidly as [AH2] is increased. The rate of polymerization is proportional to [MBA] and [AH2]. Kinetic results indicate that semi-quinone (DH) dye radical and semi-oxidized form ($$\mathop {\mathop A\limits^ \bullet }\limits^ - $$) of ascorbic acid are unable to initiate polymerization. Formation of H2O2 is proposed and confirmed. A suitable mechanism is proposed in accordance with experimental results obtained

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