Radiation-chemical effects on the structural-group composition of model mixtures of n-hexane−n-hexene in ratios of 95/5, 90/10, 80/20, and 60/40% under static conditions were studied. Laboratory studies were performed on a 60Co gamma-radiation source at a dose rate of P = 0.076 Gy/s in the absorbed dose range D = 27–78 kGy. The density, viscosity, and iodine numbers of the n-hexane−n-hexene mixtures were determined immediately after irradiation and 1, 2, and 7 months after irradiation at various absorbed doses to observe post-irradiation effects. The initial direction of radiation-chemical processes in mixtures with low n-hexene contents (5–10%) consisted of dehydrogenation and olefin formation. Two processes, i.e., olefin formation and polymerization, occurred simultaneously during gamma radiolysis of mixtures rich in n-hexene (20–40%). Irradiation of n-alkenes was accompanied by polymerization proceeding through a chain mechanism. The density and viscosity increased after irradiation of the mixtures while the iodine numbers decreased. The rate of polymerization during radiolysis of the n-hexane−n-hexene mixtures depended on the olefin concentration in the system and the absorbed dose. Polymerization became the dominant process in systems containing >20% olefins at doses >45 kGy.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 90, No. 4, pp. 569–576, July–August, 2023.
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Jabbarova, L.Y., Mustafaev, I.I. & Akbarov, R.I. Post-Irradiation Effects of the Influence of Radiation on a Mixture of Hydrocarbons. J Appl Spectrosc 90, 761–768 (2023). https://doi.org/10.1007/s10812-023-01593-9
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DOI: https://doi.org/10.1007/s10812-023-01593-9