$gamma$-RAY-INDUCED GRAFT COPOLYMERIZATION. V. THE GRAFT COPOLYMERIZATION OF METHACRYLIC ACID TO POLYETHYLENE BY A PRE-IRRADIATION TECHNIQUE
Polyethylene (PE) film samples (0.07 mm thick, 1 x 10 cm in size) were irradiated by gamma rays from a 470-C Co/sup 60/ source at 6.7 x 10/sup 4/ r/hr on a 3000-C source at 3.2 x 10/sup 4/ r/hr in air. The effects of the induced graft copolymerization of the monomer to PE were investigated. Graft copolymerization could be initiated by both radicals and peroxides produced during the irradiation, and only by the latter if the irradiated PE was stored for a long time during which the trapped radicals gradually decayed. The degree of grafting induced by both radicals and peroxides was not proportional to the total dosage, but it was proportional when grafting was induced only by the peroxides. Hence, the degree of grafting induced in the former case was 4-5 times greater than the latter case within the irradiation temperature range of -- 78 to 0 deg C. It made very little difference when the temperature reached 40 deg C or above. The activation energy of the peroxide initiated grafting was 22 kcal/ mol. The trapped radical was more stable in low rather than high pressure polyethylene. (OID)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-17-008182
- OSTI ID:
- 4752774
- Journal Information:
- Kobunshi Kagaku (Japan) Changed to Kobunshi Ronbunshu, Journal Name: Kobunshi Kagaku (Japan) Changed to Kobunshi Ronbunshu Vol. Vol: 9; ISSN KOKAA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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