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Determination of exchange enthalpy and entropy parameters of the equation‐of‐state theory for poly(dimethyl siloxane) and some aromatic solvents by inverse gas chromatography
Author(s) -
Cankurtaran Özlem,
Yilmaz Ferdane
Publication year - 2000
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(200001)49:1<99::aid-pi300>3.0.co;2-x
Subject(s) - inverse gas chromatography , benzene , enthalpy , toluene , siloxane , chemistry , isopropyl , gas chromatography , solvent , thermodynamics , organic chemistry , chromatography , polymer , physics
The specific retention volumes, V g o of toluene, ethyl benzene, n ‐propyl benzene and isopropyl benzene on poly(dimethyl siloxane)(PDMS) were measured at temperatures between 333 and 403 K by inverse gas chromatography. The parameters of hard‐core interaction, χ t ∞ , effective exchange energy, X 12 , exchange enthalpy, X 12 , and exchange entropy, Q 12 in the equation‐of‐state theory were determined. The parameters χ t ∞ of the isopropyl benzene‐PDMS pair decreased from 0.65 to 0.60 while those of others decreased from around 0.77 to 0.69 with increasing temperature. The values of the parameters X 12 also decreased as molecular weight of the substituted aliphatic group on the benzene ring of the solvent increased, ie 15 J cm −3 in toluene and 5 J cm −3 in isopropyl benzene. Both X 12 and Q 12 show negligible dependence on temperature. © 2000 Society of Chemical Industry