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The thermodynamics of dissolution of low-molecular-mass compounds in polymethyl[2′-(3-trifluoromethyl-2,2,3-trifluorocyclobutyl)ethyl]siloxane studied via inverse gas chromatography

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Abstract

The effect of the 2′-(3-trifluoromethyl-2,2,3-trifluorocyclobutyl)ethyl radical in fluorosiloxane on the thermodynamics of dissolution of various low-molecular-mass compounds in this polymer is studied via inverse gas chromatography. The activity coefficients at infinite dilution, Ω ∞1 , in the temperature range 20–100°C are determined for C6–C8 n-alkanes, cyclohexane, benzene, toluene, tetrachloromethane, trichloromethane, 2-butanone, and ethyl acetate. Flory-Huggins interaction parameters χ ∞12 are calculated. It is shown that hydrocarbons are poor solvents (Ω ∞1 > 6, χ ∞12 > 0.5) and that the studied fluorosiloxane is not inferior to commercial polymethyl(3,3,3-trifluoropropyl)siloxane with respect to stability in nonpolar liquid media in the range 20–70°C. Trichloromethane (above 50°C) and compounds containing a carbonyl group are found to be good solvents. The dispersion component of the solubility of the polymer, δ 2, is determined to be 14.0 (J/cm3)1/2 at 20°C and slightly lower, 13.5 (J/cm3)1/2, at 100°C. Possible causes of these low values of δ2 are discussed.

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Authors and Affiliations

  1. Lebedev Research Institute of Synthetic Rubber, Gapsal’skaya ul. 1, St. Petersburg, 198035, Russia

    A. N. Genkin, Yu. V. Khoroshavina, G. A. Nikolaev & A. P. Voznyakovskii

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  1. A. N. Genkin
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  2. Yu. V. Khoroshavina
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  3. G. A. Nikolaev
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  4. A. P. Voznyakovskii
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Corresponding author

Correspondence to Yu. V. Khoroshavina.

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Original Russian Text © A.N. Genkin, Yu.V. Khoroshavina, G.A. Nikolaev, A.P. Voznyakovskii, 2013, published in Vysokomolekulyarnye Soedineniya, Ser. A, 2013, Vol. 55, No. 4, pp. 384–390.

This work was supported by the Ministry of Education and Science of the Russian Federation (State Contract no. 16.523.12.3007).

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Genkin, A.N., Khoroshavina, Y.V., Nikolaev, G.A. et al. The thermodynamics of dissolution of low-molecular-mass compounds in polymethyl[2′-(3-trifluoromethyl-2,2,3-trifluorocyclobutyl)ethyl]siloxane studied via inverse gas chromatography. Polym. Sci. Ser. A 55, 218–224 (2013). https://doi.org/10.1134/S0965545X13040019

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  • DOI: https://doi.org/10.1134/S0965545X13040019

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