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    Determination of glass transition temperature and surface properties of novel chalcone modified poly (styrene) based polymer
    (Vinca Inst Nuclear Sci, 2019) Adıgüzel, Ayşegül Çiğdem; Cakar, Fatih; Senkal, Bahire Filiz; Cankurtaran, Ozlem; Hepuzer Gursel, Yesim; Karaman, Ferdane
    The novel chalcone modified poly (styrene) based polymer (PVBC-DMAC) has been prepared and characterized. By using the inverse gas chromatography method, we determined glass transition temperature and surface properties of PVBC-DMAC. The obtained glass transition temperature, T-g, is a good agree with the one obtained by differential scanning calorimetry. Also considering some isomeric alcohol and acetate solvents in the temperature range from 303.2 K to 353.2 K, we investigated the polymer selectivity. The parameters K-A (acidic) and K-D (basic) of the PVBC-DMAC surface were calculated. The obtained K-A, K-D values reflected that PVBC-DMAC surface has a basic character.
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    Investigation of thermodynamic properties of Amine Modified Polystyrene and its use for separation of isomers
    (Elsevier, 2022) Adiguzel, Aysegul Cigdem; Korkmaz, Burak; Cakar, Fatih; Cankurtaran, Ozlem; Senkal, Bahire Filiz
    In this study, thermodynamic properties, glass transition temperature and isomer separation ability of PVBC (poly (vinyl benzyl chloride)) -Diethanol amine (PVBC-DEA) polymer was investigated by IGC method. For purpose, the retention diagrams were drawn using interactions between PVBC-DEA with selected isomer solvents (i-butyl acetate, n-butyl acetate and t-butyl acetate) at between 85 and 110 degrees C. The glass transition temperature value of the polymer was determined from the retention diagrams as 76 degrees C and the obtained value, it has been understood that this value is compatible with 75.2 degrees C found by differential scanning calorimetry. The selectivity coefficients, alpha, of the isomer solvents were determined for the PVBC-DEA in the infinite dilution, according to the results obtained, it was revealed that the polymer can separate the isomers. The polymer-solvent interaction parameters for Flory-Huggins theory, chi(infinity)(12), and the equation of state theory, chi(12)*, the effective exchange energy parameters, chi(eff), the weight fraction activity coefficient, Omega(infinity)(1), and also the partial molar heat of mixing at infinite dilution of solvent, Delta(H) over bar (infinity)(1), the molar heat of vaporization of solvent, Delta(H) over bar (v), and the partial molar heat of sorption of solvent, Delta(H) over bar (s), were calculated between 85 and 110 degrees C. The obtained results were discussed. (C) 2022 Elsevier B.V. All rights reserved.
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    THERMODYNAMICS OF A CHALCONE-BASED POLYMER BY INVERSE GAS CHROMATOGRAPHY METHOD
    (Yildiz Technical Univ, 2020) Adıgüzel, Ayşegül Çiğdem; Korkmaz, Burak; Cakar, Fatih; Cankurtaran, Ozlem; Hepuzer Gursel, Yesim; Senkal, Bahire Filiz
    In this study, an inverse gas chromatography (IGC) study of thermodynamic interactions of a chalcone modified poly (styrene) based polymer (PVBC-DMAC) with some solvents was presented. For this purpose, the retention data of carefully selected polar and non-polar solvents on PVBC-DMAC was obtained by IGC instrument at temperatures between 358.2 K and 383.2 K. Then, the polymer-solvent interaction parameters for Flory-Huggins theory, chi(infinity)(12) and the equation of state theory, chi(12)*, the effective exchange energy parameters, X-eff, the weight fraction activity coefficient, Omega(infinity)(1), and also the partial molar heat of mixing at infinite dilution of solvent, Delta(H) over bar (infinity)(1), the molar heat of vaporization of solvent, Delta(H) over bar (nu), and the partial molar heat of sorption of solvent, Delta(H) over bar (s)(1) were calculated. The obtained results were discussed.