Effect of an additive on the radiation resistance of polyethylene and ethylene–propylene copolymer

Fujimura, Takashi; Arakawa, Kazuo; Hayakawa, Naohiro; Kuriyama, Isamu

doi:10.1002/app.1982.070270718

Cited by 8 publications

References 9 publications

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Effect of large dosage irradiation in vacuo on polyethylene

Fujimura

Hayakawa

Kuriyama

1982

J of Applied Polymer Sci

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synopsisThe effect of large dosage irradiation in uacuo on polyethylene was investigated by the method of double irradiation. Polyethylene was fvst irradiated with y-rays to a dosage of several hundred Mrad in uucuo at 298OK. The formed radicals were destroyed, and the polymer, changed chemically and morphologically, was irradiated again in uacuo at 77OK with a dose of 12.7 Wad. The thermal decay of radicals produced in polyethylene by the second irradiation was investigated. The results show that many double bonds are formed in the sample irradiated to several hundred &ad on the first irradiation. Alkyl radicals produced by the second irradiation react with these double ixmds yielded by the first irradiation to form a large number of allyl radicals. These allyl radicals are much more stable than alkyl radicals in uacuo at 298OK. In a sample not exposed to the first irradiation, almost all radicals formed by the second irradiation decay to form stable products. C r e formed by a large amount of irradiation make the polyethylene matrix more rigid. This rigidity slows down the radical decay. These results suggest that the rate of radical accumulation in polyethylene irradiated in uacuo increases as the dosage increases.

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Effect of large dosage irradiation in vacuo on polyethylene

Fujimura

Hayakawa

Kuriyama

1982

J of Applied Polymer Sci

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Nature of yeast cells immobilized by radiation polymerization. Activity dependence on the water content of polymer carriers

Fujimura

Kaetsu

1987

Biotech & Bioengineering

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Higher activity of ethanol production due to higher density of yeast cells was observed in yeast cells immobilized with artificial polymer carriers of higher water content based on methoxypolyethyleneglycol methacrylate and 2-hydroxyethylacrylate. These polymer carriers were prepared by radiation-induced polymerization below 0 degrees C. Yeast cells were immobilized with these carriers by adsorption method during multiplication. Two possible reasons for higher activity were discussed.

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Radiation‐induced oxidation of polymers. Effect of antioxidant and antirad agent on oxygen consumption and gas evolution

Arakawa

Seguchi

Hayakawa

et al. 1983

J. Polym. Sci. Polym. Chem. Ed.

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The effects of antioxidants and of an antirad agent mixed in polyethylene and ethylene‐propylene copolymer were investigated by means of oxygen consumption and gas evolution. The antioxidants were NBC, Irganox 1010, and DPPD, and the antirad agent was propyl fluoranthene (PFR). A small amount of the antioxidant (0.5 phr) in polymer decreased oxygen consumption by one‐half or one‐third compared with pure polymer, but the activity was lost with increasing irradiation. The antirad agent also decreased oxygen consumption and it was assumed to act as the energy transfer agent in the polymer matrix.

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Effect of an additive on the radiation resistance of polyethylene and ethylene–propylene copolymer

Cited by 8 publications

References 9 publications

Effect of large dosage irradiation in vacuo on polyethylene

Effect of large dosage irradiation in vacuo on polyethylene

Nature of yeast cells immobilized by radiation polymerization. Activity dependence on the water content of polymer carriers

Radiation‐induced oxidation of polymers. Effect of antioxidant and antirad agent on oxygen consumption and gas evolution

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