Radiation Effects on Dimethyl-diphenyl Siloxane Copolymer. : I. Protective Effect of Phenyl Radical on the Cross-linking.
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概要
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The radiation effects both of polydimethyl siloxane and dimetyl-diphenyl siloxane copolymers were studied by the use of gamma rays of cobalt-60 in order to estimate the protective effect due to phenyl radical against the radiation-induced cross-linking. The viscosity of irradiated sample increased with the absorbed dose and finally the sample became gel. The efficiency of cross-linking of copolymers is remarkably reduced with increasing concentration of diphenyl siloxane. The minimum absorbed dose for gel formation, the efficiencies of cross-linking per monomer unit were obtained as a function of the concentration of phenyl radical. It is estimated that the protective effect of diphenyl siloxane may extend over five or six neighbouring monomers of dimethyl siloxane.
- 1960-08-05
著者
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Koike Mitsuru
Japan Atomic Energy Research Institute
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Danno Akibumi
Japan Atomic Energy Research Institute
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Koike M.
Japan Atomic Energy Research Institute
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