Abstract
We studied previously the effect of polymerization temperature on the qualities of P. V. A. and the properties of its fibre, and the qualities of P. V. A. and the boiling-water resistance of its fibre were found improved by low temperature polymerization. In order to improve the qualities of P. V. A. as spinning material, the effect of the polymerization solvents at 20°C in the presence of tri-n-butylboron catalyst on the qualities of P. V. A. was also studied.Results obtained were: that there was no better solvent than methanol and the degree of swelling of P. V. A. film, the iodine adsorption, the rate of preipitation in dimethylsulfoxide-water system, and the boiling water resistance of the heat treated fibre were affected by the polymerization solvents.Such phenomena seem to depend upon the solvent which affects somewhat on polymer structure in propagation reaction.
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