SYNTHESIS OF COPOLYMER GRAFTS ON POLYMERS PREVIOUSLY EXPOSED TO IONIZING RADIATION. III. COMPARATIVE STUDIES OF GRAFTING ON POLYETHYLENE AND POLYPROPYLENE (in French)
Journal Article
·
· J. Polymer Sci.
The kinetics of the grsfting of acrylonitrile on a low pressure polyethylene and on polypropylene, both prepared with the same catalyst, were compared. The two polymers were preirradiated by gamma rays in the presence of air, and then warmed under vacuum in the monomer at different temperatures. The shape of the conversion curves varies with preirradiation dose. For high doses, the grafting reaction is at first very fast, but rapidly stops for a limiting value of grafting. This limiting value is smaller, the higher the preirradiation dose. The relationships between the grafting rate and the dose and intensity of preirradiation are different for polyethylene and polypropylene. The same applies to the influence of temperature on the grafting reaction. The amount of homopolymer formed (polyacrylonitrile) is much greater in the case of grafting on polypropylene. The radiochemical peroxidation leads mainly to hydroperoxides POOH for polypropylene and to diperoxides POOP for polyethylene. In the case of polypropylene, the reaction- is controlled by the rate of diffusion of the monomer in the polymer film. The difference in the mp for crystallites of polyethylene and polypropylene gives an understanding of the effect of the grafting temperature on the kinetics observed in tne two systems. (auth)
- Research Organization:
- Faculte des Sciences, Paris
- NSA Number:
- NSA-15-019424
- OSTI ID:
- 4003696
- Journal Information:
- J. Polymer Sci., Journal Name: J. Polymer Sci. Vol. Vol: 48: No. 150
- Country of Publication:
- Country unknown/Code not available
- Language:
- French
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