| 摘要 |
One or more vinyl or vinylidene compounds may be polymerized in the presence, as initiator, of a boron trialkyl such as boron trimethyl, triethyl, triisopropyl, triisobutyl, triamyl, tridodecyl, trioctodecyl and tricyclohexyl. The monomer may be butadiene, isoprene, dimethylbutadiene, chlorobutadiene, styrene, a -methylstyrene, styrene substituted in the benzene nucleus by a halogen or alkyl group, divinylbenzene, acrylonitrile, acrylic acid, methacrylic acid, methyl methacrylate, butyl acrylate, dodecyl acrylate, vinyl acetate, vinyl chloride, vinylidene chloride or isobutylene. Polymerization may be carried out in bulk, in suspension, in emulsion, or in solution in a solvent such as cyclohexane, benzene, toluene, chlorobenzene, ethylene chloride, methylene chloride, chloroform, dibutyl ether, dioxane, tetrahydrofurane, acetone, cyclohexanone or dimethyl formamide. Polymerization may be effected by adding the boron trialkyl slowly to the monomer or by introducing the monomer slowly into a prepared solution of the boron trialkyl. Polymerization may be carried out in the presence of oxygen, e.g. by bubbling a slow current of air through the reaction mixture.
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