Synthesis and Characterization of Methylmethacrylate-alt-N-vinyl-2-pyrrolidone Initiated by Phosphorus Containing 1,2 Dipolar Compound |
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Authors: | Kiran Prajapati |
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Affiliation: | Chemistry Department , Dayanand Girls College, Civil Lines , Kanpur |
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Abstract: | Copolymerization of methylmethacrylate (MMA) with 1-vinyl-2-pyrrolidone (N-VP), initiated by p-nitrobenzyl triphenyl phosphonium ylide in dioxane at 60°C for 60 min under inert atmosphere of nitrogen yields alternating copolymer as evidenced by the values of r 1 = 0.01 and r 2 = 0.02. The kinetic expression was Rp ∝ I]0.75MMA]1.2VP]1.2. The overall activation energy is 45.4 kJ/mol. The FTIR bands of OCH3 of MMA at 1725 cm?1 and –C=O of N-VP at 1679 cm?1, confirms the incorporation of both the monomers in the copolymer. The glass transition temperature of the copolymer is 133°C. The GPC data shows the polydispersity index at about 1.5. The ESR spectroscopy confirm phenyl radical responsible for initiation. |
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Keywords: | Copolymerization Kinetics Mechanism Methylmethacrylate (MMA) N-Vinyl-2-pyrrolidone (N-VP) p-Nitrobenzyltriphenyl phosphonium ylide (p-NBTPY) |
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