Effects of Alkyl Halides on the γ-Ray Induced Polymerization of Ethylene in Liquid Carbon Dioxide
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概要
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The <SUP>60</SUP>Co γ-ray induced polymerization of ethylene in a liquid carbon dioxide solvent was carried out under a pressure of 400 kg/cm<SUP>2</SUP> at 30°C in the presence of such alkyl halides as CH<SUB>2</SUB>Cl<SUB>2</SUB>, CHCl<SUB>3</SUB>, CCl<SUB>4</SUB>, C<SUB>2</SUB>H<SUB>5</SUB>Cl, C<SUB>2</SUB>H<SUB>5</SUB>Br, C<SUB>2</SUB>H<SUB>5</SUB>I, C<SUB>2</SUB>H<SUB>4</SUB>Cl<SUB>2</SUB>, C<SUB>2</SUB>H<SUB>2</SUB>Cl<SUB>4</SUB>, C<SUB>2</SUB>Cl<SUB>6</SUB>, C<SUB>2</SUB>F<SUB>6</SUB>, C<SUB>2</SUB>F<SUB>5</SUB>Cl, C<SUB>2</SUB>F<SUB>4</SUB>Cl<SUB>2</SUB>, C<SUB>2</SUB>H<SUB>3</SUB>Cl<SUB>3</SUB>, and C<SUB>2</SUB>F<SUB>2</SUB>Cl<SUB>4</SUB>, and their effects on the polymerization rate and the molecular weight of the polymer formed were investigated. Both the rate and the molecular weight were increased by adding C<SUB>2</SUB>F<SUB>4</SUB>-Cl<SUB>2</SUB>, C<SUB>2</SUB>F<SUB>5</SUB>Cl, and C<SUB>2</SUB>F<SUB>6</SUB>. A study of the radiolysis of these three fluorocarbons by mass spectrometric analysis showed that bond scissions of these substances took place mainly at the C–G bond. When other halogen compounds besides the three fluorocarbons were added to the reaction mixture, the rate and the molecular weight were decreased and C–X (X: halogen) bond scission was predominant in those substances. On the basis of these results, the role of the additives in the polymerization was discussed in relation to their radiolysis reactions.
- 公益社団法人 日本化学会の論文
著者
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Kagiya Tsutomu
Japan Atomic Energy Research Institute, Takasaki Radiation Chemistry Research Establishment
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Hagiwara Miyuki
Japan Atomic Energy Research Institute, Takasaki Radiation Chemistry Research Establishment
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Okamoto Hidemasa
Japan Atomic Energy Research Institute, Takasaki Radiation Chemistry Research Establishment
関連論文
- Effects of Alkyl Halides on the γ-Ray Induced Polymerization of Ethylene in Liquid Carbon Dioxide
- Kinetics of the γ-Ray Induced Polymerization of Ethylene in 1,2-Dichlorotetrafluoroethane