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Polymer films as indicator of hydrogen spillover through the gas phase

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Abstract

Films of poly-ε-caproamide (PA), polyethylene (PE), and polyethylene terephthalate (PET) were used for detection of hydrogen spillover through the gas phase. The hydrogen used in the experiments contained tritium activated by two procedures (W wire, 2000 K; 5% Pd/C, 335 K). The radioactivity of the films was recorded by classical and digital autoradiography and by liquid scintillation counting. Under the action of “hot” atoms generated on a W wire, the maximal specific radioactivity of the films, equal to 420, 415, and 330 mCi cm–2 for PA, PE, and PET, respectively, was reached in 100 s. Preliminary thermalization of the atoms to a temperature of 77–335 K influenced the decrease in the film radioactivity differently. The effective activation energy of the reaction in the range 298–318 K was 21, 30, and 12.5 kJ mol–1 for PA. PE, and PET, respectively. Under the conditions of heating 5% Pd/C to 335 K for 25 min, the radioactivity of PA, PE, and PET was 1.6, 0.05, and 0.15 μCi cm–2, respectively. The revealed difference in the radioactivity of the films suggests different mechanisms of the interaction of tritium with organic molecules at different activation methods.

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Authors and Affiliations

  1. Radiochemistry Chair, Chemical Faculty, Moscow State University, Moscow, Russia

    I. A. Razzhivina, G. A. Badun, M. G. Chernysheva, V. I. Korobkov & A. E. Zhirnov

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  1. I. A. Razzhivina
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  2. G. A. Badun
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  3. M. G. Chernysheva
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  4. V. I. Korobkov
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  5. A. E. Zhirnov
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Correspondence to I. A. Razzhivina.

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Original Russian Text © I.A. Razzhivina, G.A. Badun, M.G. Chernysheva, V.I. Korobkov, A.E. Zhirnov, 2017, published in Radiokhimiya, 2017, Vol. 59, No. 3, pp. 248–254.

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Razzhivina, I.A., Badun, G.A., Chernysheva, M.G. et al. Polymer films as indicator of hydrogen spillover through the gas phase. Radiochemistry 59, 284–291 (2017). https://doi.org/10.1134/S1066362217030110

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  • DOI: https://doi.org/10.1134/S1066362217030110

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