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

Autor: G. A. Nikolaev, A. N. Genkin, Yu. V. Khoroshavina, A. P. Voznyakovskii
Rok vydání: 2013
Předmět:
Zdroj: Polymer Science Series A. 55:218-224
ISSN: 1555-6107
0965-545X
DOI: 10.1134/s0965545x13040019
Popis: 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, Ω1∞, in the temperature range 20–100°C are determined for C6–C8n-alkanes, cyclohexane, benzene, toluene, tetrachloromethane, trichloromethane, 2-butanone, and ethyl acetate. Flory-Huggins interaction parameters χ12∞ are calculated. It is shown that hydrocarbons are poor solvents (Ω1∞ > 6, χ12∞ > 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, δ2, 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.
Databáze: OpenAIRE
Externí odkaz: