Synthesis, Kinetics and Mechanism of Terpolymerization of Styrene, Vinyl Acetate with Acrylonitrile Initiated by P-Nitrobenzyl Triphenyl Phosphonium Ylide

Kiran Prajapati, Anuradha Varshney

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DOI: 10.4236/ijoc.2011.12010                

Abstract

Synthesis of terpolymers consisting of two electron-donating monomers, viz. styrene and vinyl acetate with one electron-accepting monomer, i.e. acrylonitrile, initiated by p-nitrobenzyl triphenyl phosphonim ylide in dioxane as diluent at 65°C for 150 min has been studied. The kinetic expression is R_pα[I]^0.8[Sty] ^1.2[VA] ^1.4 [AN]^1.2. The terpolymer composition was determined by the Kelen-Tüdos method. The values of reactivity ratios using r₁ (Sty + VA) = 0.1 and r₂ (AN) = 0.005. The overall activation energy is 46 kJ●mol●L^–1. The formation of terpolymer is confirmed by the FTIR spectra showing bands at 3030 cm^–1, 1598 cm^–1, and 2362 cm^–1, confirming the presence of phenyl, acetoxy and nitrile group respectively. The terpolymer has been characterized by ¹H-Nuclear Magnetic Resonance, ¹³C-Nuclear Magnetic Resonance. The Differential Scanning Calorimetric curve shows the T_g of the polymer as 149.5°C. A scanning electron microscope confirms the polymer to be phosphorus free. Electron.Spin.Resonance spectra confirms phenyl radical responsible for initiation.

Keywords

P-Nitrobenzyltriphenyl Phosphonium Ylide (P-NBTPY), Terpolymer, Kinetics And Mecha-nism

Conflicts of Interest

The authors declare no conflicts of interest.

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