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Thermodynamic properties of carbynoid structures in the 0—340 K range

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Abstract

The temperature dependences of the heat capacity (C p°) of carbynoid structures prepared by alkaline dehydrochlorination of poly(vinylidene chloride) and 1,1,2- and 1,2,3-polytrichlorobutadienes were studied by adiabatic vacuum calorimetry between 5 and 340 K with an accuracy of ∼0.2%. The low-temperature relaxation transitions and abnormal patterns of the C p° vs. T dependences were identified and characterized. The experimental results were used to calculate the thermodynamic functions C p°(T), H°(T) – H°(0), S°(T) – S°(0), and G°(T) – H°(0) for 0—340 K. These data were compared with the corresponding data for carbyne produced by oxidative dehydropolycondensation of acetylene, which is a mixture of amorphous α- and β-forms with a minor impurity of crystals of both forms.

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Authors and Affiliations

  1. Research Institute of Chemistry at the N. I. Lobachevsky Nizhni Novgorod State University, 23 block 5, prosp. Gagarina, 603950, Nizhni Novgorod, Russian Federation

    B. V. Lebedev & T. A. Bykova

  2. A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 ul Vavilova, 119991, Moscow, Russian Federation

    I. I. Vointseva

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  1. B. V. Lebedev
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  2. T. A. Bykova
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  3. I. I. Vointseva
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Lebedev, B.V., Bykova, T.A. & Vointseva, I.I. Thermodynamic properties of carbynoid structures in the 0—340 K range. Russian Chemical Bulletin 50, 1533–1538 (2001). https://doi.org/10.1023/A:1013061813342

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