Copolymerization of methylmethacrylate with styrene using triphenylbismuthoniumylide as radical initiator

Authors

  • Radha Bajpai,

    1. Department of Chemistry, Harcourt Butler Technological Institute, Kanpur, 208002, India
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  • A. K. Srivastava

    Corresponding author
    1. Department of Chemistry, Harcourt Butler Technological Institute, Kanpur, 208002, India
    • Department of Chemistry, Harcourt Butler Technological Institute, Kanpur, 208002, India
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Abstract

Bismuthoniumylide-initiated radical copolymerization of methylmethacrylate with styrene at 60 ± 0.2°C using dioxane as an inert solvent, follows ideal kinetics (Rp ∝ [ylide]0.5 [MMA]1.0 [sty]1.0), and yields alternating copolymer as evident from NMR spectroscopy. The values of reactivity ratios r1 and r2, calculated from Finemann–Ross method are 0.48 and 0.45, respectively. The system follows ternary molecular complex mechanism. The radical mode of polymerization has been confirmed by ESR spectroscopy and the effect of hydroquinone. The value of activation energy and kmath image/kt are 65.0 KJ mol−1 and 2.5 × 10−5 l mole−1 s−1, respectively. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 2774–2781, 2001

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