Abstract
Abstract The polymerization of allyl vinyl ether was carried out by means of BF3·OEt2. The reaction proceeded through the vinyl double bond, and a polymer with allyl ether side chains was obtained. The effects of the polymerization conditions on the stereoregularity of the polymer were studied by means of NMR spectroscopy using a spin decoupling technique. A highly isotactic polymer was obtained at −78°C in toluene. The isotacticity of the polymer decreased slightly with a rise in the reaction temperature and with an increase in the initial monomer concentration. When the reaction was carried out in a mixture of toluene and nitroethane, a marked decrease in the isotacticity and the solution viscosity of the polymer was observed with an increase in the amount of nitroethane. The solution viscosity of the polymer decreased with an increase in the polymerization temperature and the catalyst concentration, and increased with an increase in the initial monomer concentration. The reaction between the polymer and HBr in acetic acid yielded a ternary copolymer consisting of vinyl alcohol, vinyl acetate, and vinyl bromide units.
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