Curcumin,A Novel Natural Photoinitiator for the Copolymerization of Styrene and Methylmethacrylate |
| |
| Authors: | Anuradha Mishra Swati Daswal |
| |
| Institution: | 1. Department of Chemistry , University Institute of Engineering and Technology, CSJM University , Kanpur , India anuradha_mishra@rediffmail.com;3. Department of Chemistry , University Institute of Engineering and Technology, CSJM University , Kanpur , India |
| |
| Abstract: | Curcumin (Cur), a natural colorant found in the roots of the Turmeric plant, has been reported for the first time as photoinitiator for the copolymerization of styrene (Sty) and methylmethacrylate (MMA). The kinetic data, inhibiting effect of benzoquinone and ESR studies indicate that the polymerization proceeds via a free radical mechanism. The system follows ideal kinetics (Rp αCur]0.5Sty]0.97MMA]1). The reactivity ratios calculated by using the Finemann–Ross and Kelen‐Tudos models were r1(MMA)=0.46 and r2(Sty)=0.52. IR and NMR analysis confirmed the structure of the copolymer. NMR spectrum showing methoxy protons as three distinct groups of resonance between 2.2–3.75 δ and phenyl protons of styrene at 6.8–7.1 δ confirmed the random nature of the copolymer. The mechanism for formation of radicals and random copolymer of styrene and MMA Sty‐co‐MMA] is also discussed. |
| |
| Keywords: | photopolymerization curcumin Sty‐co‐MMA NMR ESR |
|
|
