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Determination of exchange enthalpy and entropy parameters of poly(dimethyl siloxane) with some n ‐alkanes by inverse gas chromatography
Author(s) -
Cankurtaran Özlem,
Yilmaz Ferdane
Publication year - 1996
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(199611)41:3<307::aid-pi600>3.0.co;2-y
Subject(s) - inverse gas chromatography , enthalpy , pentane , nonane , hexane , heptane , gas chromatography , siloxane , alkane , thermodynamics , flory–huggins solution theory , carbon fibers , chemistry , inverse temperature , materials science , polymer , chromatography , analytical chemistry (journal) , hydrocarbon , organic chemistry , physics , composite number , composite material
The total interaction parameter at infinitely high polymer concentration. χ t ∞ , and the effective exchange energy parameter, X̄ 12 , of poly(dimethyl siloxane) with n ‐pentane, n ‐hexane, n ‐heptane and n ‐nonane were determined around room temperature using the inverse gas chromatography technique. The values of χ t ∞ are in agreement with corresponding literature values. The exchange enthalpy X 12 and entropy, Q 12 , parameters were determined at the same temperature. The X 12 parameters increase with the carbon number of the n ‐alkanes, while their temperature dependence is almost negligible. The Q 12 parameters are approximately independent of temperature and carbon number of the n ‐alkanes.