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A study of some equation‐of‐state parameters of poly(methylhydrosiloxane‐ co ‐dimethylsiloxane) with some solvents by gas chromatography
Author(s) -
Coskun Selin,
Cankurtaran Özlem,
Eran Belkis B.,
Sarac Ayfer
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.25771
Subject(s) - inverse gas chromatography , flory–huggins solution theory , hildebrand solubility parameter , enthalpy , entropy of mixing , thermodynamics , gas chromatography , solvent , chemistry , activity coefficient , polymer , solubility , enthalpy change of solution , copolymer , sorption , chromatography , organic chemistry , aqueous solution , adsorption , physics
Trace amount of methyl acetate, ethyl acetate, tert ‐butyl acetate, pentane, hexane, and heptane were passed through the chromatographic column loaded with poly(methylhydrosiloxane‐ co ‐dimethylsiloxane) coated on Chromosorb W. The retention diagrams of the solvents on the copolymer were plotted by means of specific retention volumes at temperatures between 40 and 80°C by inverse gas chromatography technique. In this study, some thermodynamic interaction parameters such as Flory–Huggins polymer–solvent interaction parameter, equation‐of‐state polymer–solvent interaction parameter, effective exchange energy parameter, and weight fraction activity coefficients at infinite dilution of the solvent were determined. Then, the exchange enthalpy parameter and entropy parameter were determined by using a relation for the enthalpy interaction parameter of the equation‐of‐state theory, which is arranged for the inverse gas chromatography conditions. Later, the partial molar heat of sorption and the partial molar heat of mixing were obtained. The solubility parameter of this copolymer was determined as 6.64 (cal/cm 3 ) 1/2 at room temperature. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 1627–1631, 2007