Chinese Journal of Chromatography ›› 2014, Vol. 32 ›› Issue (7): 746-752.DOI: 10.3724/SP.J.1123.2014.04028

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Determination of thermodynamic properties of poly(cyclohexyl methacrylate) by inverse gas chromatography

Ismet KAYA1, Cigdem Yigit PALA1,2   

  1. 1. Canakkale Onsekiz Mart University, Faculty of Sciences and Arts, Department of Chemistry, Polymer Synthesis and Analysis Laboratory, Canakkale 17020, Turkey;
    2. Kaleseramik AR-GE Research, Kaleseramik R & D Center, Kaleseramik Canakkale Kalebodur Ceramic Industries Inc., Canakkale 17020, Turkey
  • Received:2014-04-18 Revised:2014-05-16 Online:2014-07-08 Published:2014-06-25

Abstract:

In this work, some thermodynamic properties of poly(cyclohexyl methacrylate) were studied by inverse gas chromatography (IGC). For this purpose, the polymeric substance was coated on Chromosorb W and which was filled into a glass column. The retention times (tr) of the probes were determined from the interactions of poly(cyclohexyl methacrylate) with n-pentane, n-hexane, n-heptane, n-octane, n-decane, methanol, ethanol, 2-propanol, butanol, acetone, ethyl methyl ketone, benzene, toluene and o-xylene by IGC technique. Then, the specific volume (Vg0) was determined for each probe molecule. By using (1/T; lnVg0) graphics, the glass transition temperature of poly(cyclohexyl methacrylate) was found to be 373 K. The adsorption heat under the glass transition temperature (ΔHa), and partial molar heat of sorption above the glass transition (ΔH1S), partial molar free energy of sorption (ΔG1S) and partial molar entropy of sorption (ΔS1S) belonging to sorption for every probe were calculated. The partial molar heat of mixing at infinite dilution (ΔH1), partial molar free energy of mixing at infinite dilution (ΔG1), Flory-Huggins interaction parameter (χ12) and weight fraction activity coefficient (a1/w1) values of polymer-solute systems were calculated at different column temperatures. The solubility parameters (δ2) of the polymer were obtained by IGC technique.

Key words: inverse gas chromatography (IGC), poly(cyclohexyl methacrylate), thermodynamic properties

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