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- W2331280437 abstract "Untreated and heat-treated (at 180°C or 225°C) polyvinyl alcohol (PVA) fibers imbibing solutiins (1g/g-fiber) of various catalysts were heated with vinyl acetate in sealed tubes for graft polymerization. When potassium or ammonium persulfate were used as catalysts, the grafting proceeded smoothly under suitable conditions, but the efficiencies were generally lower than those in the case of styrene, and were affected by heating temperatures and solvents of the imbibing solutions. In the cases of hydrogen peroxide, the grafting proceded with some ease when water contents of the imbibing solutions were high, but the efficiencies were generally lower than those in the case of persuefates. In the cases of α, α′-azo-bisisobutylonitrile and benzoyl peroxide, the homopolymerization proceeded predominantly as the grafting scarcely occured.The grafting was affect to a greater extent than in the case of styrene by heat treatment of raw PVA fibers.Dry PVA fibers imbibing catalysts were also heated with vinyl acetate-methanol mixtures. The grafting proceeded slightly when fibrous structures were maintained, but proceeded considerably when fibers dissolved in monomer mixtures during the heating. In this case the droducts of about 50% increased weight dissolved almost comdletely in acetone.The grafting of vinyl acetate in emulsion states onto PVA fibers were also examined, but no desirable results were obtained.The difference of grafting behaviors between vinyl acetate and styrene onto PVA fibers was similar to that onto cellulose fibers." @default.
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- W2331280437 date "1964-01-01" @default.
- W2331280437 modified "2023-10-17" @default.
- W2331280437 title "GRAFT POLYMERIZATION OF VINYL ACETATE ONTO POLYVINYL ALCOHOL FIBERS IMBIBING CATALYSTS" @default.
- W2331280437 doi "https://doi.org/10.2115/fiber.20.555" @default.
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