STUDIES OF THE SOLUTION POLYMERIZATION OF VINYL ACETATE IN THE AQUEOUS SOLUTION OF PARTIALLY ACETYLATED POLYVINYL ALCOHOL. V. THE RADIATION-INDUCED GRAFT COPOLYMERIZATION
Graft copolymerization was induced to a considerable extent when vinyl acetate was polymerized in an aqueous solution of polyvinyl alcohol (PVA) or partially acetylated PVA under gamma irradiation. The radioinduced graft copolymerization was affected by hydroquinone. The graft efficiency, f/sub ac/, increased as PVA concentration increased. However, it reached a critical value at 4% and decreased again in more concentrated solutions. It was found that f/ sub ac/ decreases with increasing field intensity of irradiation at a finite total exposure dose. A mechanism consistent with the observations is given. The higher rate of grafting in radiation polymerization is attributed to the high free radical concentration on PVA main chain. A larger value of graft efficiency in PVA acetate solution than that in PVA solution may be explained by the affinity of vinyl acetate for PVA or PVA acetate. It was concluded that the affinity of vinyl acetate for PVA greatly promotes the grafting reaction. However, chain cross-linking of PVA must also be taken into consideration in the case of the radiation-initiated polymerization. (TCO)
- Research Organization:
- Union Industrial Research Inst., Ministry of Economic Affairs, Taipei, Taiwan, China
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-027444
- OSTI ID:
- 4660858
- Journal Information:
- J. Chinese Chem. Soc. (Taiwan), Journal Name: J. Chinese Chem. Soc. (Taiwan) Vol. Vol: 8
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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