Gamma Irradiation of Hexafluorobenzene
Summary
Radiolysis of hexafluorobenzene and benzene mixtures using cobalt-60 gamma rays revealed similar behaviors. Fluorocarbon-hydrocarbon mixtures produced more silicon tetrafluoride (SiF4) than pure fluorocarbons.
Area of Science:
- Radiochemistry
- Physical Chemistry
- Polymer Science
Background:
- Hexafluorobenzene (C6F6) and benzene (C6H6) are aromatic compounds with distinct chemical properties.
- Understanding their behavior under irradiation is crucial for predicting product formation and reaction mechanisms.
Purpose of the Study:
- To investigate the radiolysis of liquid-phase hexafluorobenzene-benzene mixtures and related systems.
- To compare the radiation chemistry of hexafluorobenzene with that of benzene.
- To explore the influence of temperature on these radiolysis processes.
Main Methods:
- Liquid-phase irradiation of hexafluorobenzene and benzene mixtures using a Cobalt-60 gamma source.
- Irradiation experiments conducted at different temperatures (20°C and 218°C).
- Analysis of reaction products, including silicon tetrafluoride (SiF4) and polymer formation.
Main Results:
- Hexafluorobenzene exhibited radiolysis behavior closely resembling that of benzene.
- Fluorocarbon-hydrocarbon mixtures generated significantly more SiF4 compared to pure fluorocarbons, indicating HF formation.
- The polymer formed from hexafluorobenzene-benzene mixtures showed a tendency towards alternating units, similar to benzene radiolysis polymers.
- Elevated temperatures (218°C) induced qualitative changes in the radiolysis of C6F6 and its mixtures with benzene, though SiF4 and polymer yields remained moderate.
Conclusions:
- Hexafluorobenzene and benzene share similarities in their gamma radiolysis.
- The formation of HF and subsequent reaction with glass vessels is a notable byproduct in mixed systems.
- Temperature plays a role in modifying the radiolysis pathways of these aromatic compounds.
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