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• W2067231446 endingPage "952" @default.
• W2067231446 startingPage "942" @default.
• W2067231446 abstract "Differential thermal analysis (DTA) has been used to determine the following: (1) the heat of photobleaching of trapped electrons in γ-irradiated 3-methylpentane (3MP) glass as a function of γ dose; (2) the heats of combination of radicals and of ions in γ-irradiated 3MP and methyltetrahydrofuran (MTHF) glasses; (3) the glass transition temperatures and the rates of enthalpy loss during 77 K annealing of 3MP-h14, 3MP-d14, 3-ethylpentane, and MTHF; (4) the effect of cooling rate and annealing time on crystallization of n-hexane in 3MP cooled to 77 K. The ΔH of neutralization of photobleached electrons in γ-irradiated 3MP at 72 K is ∼−150 kcal mole−1 at low dose, implying an upper limit of 80 kcal mole−1 for the solvation energy of the combining charges, and decreases to ∼80 kcal mole−1 for a dose of 1.2×1020 eV g−1 implying an increasing ratio of reaction with radicals to reaction with cations as the dose is increased. When γ-irradiated MTHF is warmed from 77 K, a large fraction of the trapped electrons appear to react with radicals to form carbanions, which then react with cations, the total ΔH being ∼80 kcal mole−1. The ΔH of ion pair solvation is estimated to be −120 to −150 kcal mole−1. The decrease in the enthalpy of the matrix due to relaxation during annealing in 3MP at 77 K parallels the decrease in the decay rate of trapped electrons for similar samples. Seemingly anomolous effects of sample size and shape on trapped electron decay rates in 3MP glass as a function of time of annealing at 77 K can now be rationalized in terms of the restrictions on viscous flow in different types of sample tubes." @default.
• W2067231446 created "2016-06-24" @default.
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• W2067231446 date "1975-07-15" @default.
• W2067231446 modified "2023-09-23" @default.
• W2067231446 title "Heats of reaction of trapped intermediates in γ-irradiated organic glasses and relaxation processes in unirradiated glasses measured by low temperature differential thermal analysis" @default.
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• W2067231446 doi "https://doi.org/10.1063/1.431376" @default.
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