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

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      https://www.ias.ac.in/article/fulltext/jcsc/116/02/0115-0118

    • Keywords

       

      N,N′-methylenebisacrylamide (MBA); eosin dye (D); ascorbic acid (AH2); semi-quinone dye; semi-oxidized form of ascorbic acid ($$\mathop {\mathop A\limits^ \bullet }\limits^ - $$); hydrogen peroxide (H2O2)

    • Abstract

       

      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

    • Author Affiliations

       

      Parthasarathy Tigulla1 Uma Vuruputuri1

      1. Department of Chemistry, Nizam College, Osmania University, Hyderabad - 500 001, India
    • Dates

       
  • Journal of Chemical Sciences | News

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