The Influence of Methanol in Radical Polymerization of Styrenet

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Other Title
  • スチレンのラジカル重合におけるメタノールの影響
  • Studies on radical polymerization in inhomogeneous system. I. The influence of methanol in radical polymerization of styrene.

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Radical polymerization of styrene was carried out in the presence of methanol(non-solvent for polystyrene) at 60°C. At 30 vol% or above of methanol turbidity and precipitate were observed, but no turbidity was observed below 20 vol%. The kinetic orders of monomer and initiator were 1.4 and 0.5, respectively. The rate of initiation(R1) was determined by an inhibitor method. The values for kt/kp2 were derived from R1 and the rate of polymerization (Rp), and from the relations between 1/Pn and Rp The value obtained by both methods showed a good agreement and increased with increasing methanol concentration. At the methanol concentration below 30 vol% kt/kp2 was proportional to the reciprocal of the viscosity of the medium, but at 40 and 50 vol% of methanol the value deviated markedly from the relation. It is deduced that an increase in the encounter of propagating radicals in the presence of non-solvent could be responsible for the enhanced rate of termination.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1987 (8), 1585-1588, 1987-08-10

    The Chemical Society of Japan

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