EFFECTS OF GAMMA RADIATION ON POLYMER IN SOLUTION. I. POLY(VINYL ACETATE)
Journal Article
·
· Bull. Inst. Chem. Research, Kyoto Univ.
OSTI ID:4830603
Gamma irradiation of polyvinyl acetate (PVAc) in various organic solvents at a concentration of 10 wt%, resuIted in crosslinking in methanol and benzene, but in many other organic solvents degradation occurred predominantiy. As the solvents became poorer, crosslinking was promoted at low concentrations but retarded at high concentrations of the polymer. The most optimum concentration for crosslinking of the polymer in methanol solution was about 20%, where it was found that degradation hardly ever occurred. When PVAc was irradiated in methanol- organic solvent mixtures, the rate of crosslinking was retarded as the solubility of the polymer in solution was raised. However, in methanol- water mixtures, no correlation was observed between the radioinduced changes and the solubility, but the rate of crosslinking increased monotonically with increasing water content in the mixtures, which may indicate that water is a very effective solvent for crosslinking. The radioinduced changes were very slight during irradiation at - 50 deg C but relatively large at 70 deg C. The minimum doses needed for gelation in the 10% benzene solutions were inversely proportional to the degree of polymerization of the initial polymer. It was confirmed that the density of crosslinked units was proportional to the radiation dose and that crosslinks were formed not only from the main chain radicals (not end radicals), but also from the side chain radicals. (auth)
- Research Organization:
- Kyoto Univ.
- NSA Number:
- NSA-16-018950
- OSTI ID:
- 4830603
- Journal Information:
- Bull. Inst. Chem. Research, Kyoto Univ., Journal Name: Bull. Inst. Chem. Research, Kyoto Univ. Vol. Vol: 40
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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