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- W49096904 abstract "The radiation copolymerization of tetrafluoroethylene and hexafluoropropylene was investigated at ?78 ℃ with a 20,000-curie Co60 γ-source. Values of the copolymerization rate constant were found to decrease with the increase of the amount of hexafluoropropylene the monomer mixtures. This indicates that hexafluoropropylene has a lower copolymerization reactivity. Values of n the rate equation R = KIn are 0.60, 0.78, and 0.85, as the mole fractions of hexafluoropropylene the monomer mixtures are 0.1, 0.5, and 0.7, respectively. This signifies that an increase hexafluoropropylene concentration lowers the propability of biradical termination.A post-effect of the copolymerization was noticed. It was found that values of kp/ki post-polymerization increase with the irradiation dosage. This fact is explained as due to the decrease k2 resulting from the enrichment of trapped polymeric radicals as a consequence of increased in source conversion on higher irradiation dosages.The effect of some common organic solvents and inhibitors on the copolymerization rate was also studied. Most of the results support a free-radical mechanism for this low-temperature liquid-phase radiation copolymerization; possibilities of simultaneous radical-cationic polymerization or of cationic polymerization, however, can not be ruled out." @default.
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- W49096904 date "1963-01-01" @default.
- W49096904 modified "2023-09-25" @default.
- W49096904 title "RADIATION COPOLYMERIZATION OF TETRAFLUOROETHYLENE AND HEXAFLUOROPROPYLENE" @default.
- W49096904 hasPublicationYear "1963" @default.
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