Some Solution Properties of Polyvinyl Chloride Polymerized by γ-Ray Irradiation

Abstract

Vinyl chloride was polymerized by γ-ray irradiation at-78°C, 0°C and 18°C, respectively. The solution properties of the polymer were examined. The polymer polymerized at-78°C was not soluble in tetrahydrofuran at the temperature up to 70°C. The polymer polymerized at 0°C contained small amount of tetrahydrofuran insoluble fraction. The polymer polymerized at 18°C was almost soluble in tetrahydrofuran.
The polymers polymerized at 0°C and 18°C were fractionated by the successive fractional precipitation method, using tetrahydrofrane as solvent and water-tetrahydrofuran mixture as non-solvent. The fractionates were examined osmometrically and viscometrically, and the following equation was obtained.
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The value of K obtained by Kawai and Fixman-Stockmayer's method was 2.11×10^-3. The γ-ray-polymerized polymer, as compared with a commercial polymer, keeps the linear relation up to the higher molecular weight in the Mark-Houwink equation.