Yazar "Demirelli, Kadir" seçeneğine göre listele

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    Determination of the thermodynamic properties of poly [2-(3-phenyl-3-methylcyclobutyl)-2-hydroxyethyl methacrylate-co-methacrylic acid] at infinite dilution by inverse gas chromatography
    (Scientific Technical Research Council Turkey, 2001) Kaya, İsmet; Demirelli, Kadir
    Some thermodynamic quantities were obtained for the interactions of poly [2-(3-phenyl-3-methylcyclobutyl)-2-hydroxyethyl methacrylate-co-methacrylic acid] Poly (PCHEMA-co-MA) with alcohols, ketones, acetates, aromatics and n-alkanes by inverse gas chromatography in the temperature range of 150-180 degreesC. The specific retention volumes, Vg degrees. weight fraction activity coefficients of solute probes at infinite dilution, Omega (infinity)(1) and Flory-Huggins thermodynamic interaction parameters, chi (infinity)(12) between polymers and solvents were determined. The partial molar free energy, DeltaG(1)(infinity), the partial molar heat of mixing, DeltaH(1)(infinity). at infinite dilution and the solubility parameters of the polymer, delta (2), were calculated. The copolymer was characterized by H-1-NMR, FT-IR and DSC analyses.
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    Determination of thermodynamic properties of poly (2-hydroxy ethyl methacrylate) at infinite dilution by using inverse gas chromatography
    (Freund Publishing House Ltd, 2000) Demirelli, Kadir; Kaya, İsmet; Özdemir, Eyüp
    Some thermodynamic quantities were obtained for the interactions of poly (2-hydroxy ethyl methacrylate) (PHEMA) with alcohols, ketones, acetates, aromatics and n-alkanes by the inverse gas chromatography method in the temperature range of 130-150 degreesC. The specific retention volumes, Vg degrees, weight fraction activity coefficients of solute probes at infinite dilution, Omega (infinity)(1) Flory-Huggins thermodynamic interaction parameters, chi (infinity)(12), between polymers and solvents, the partial molar free energy, DeltaG(1)(infinity), the partial molar heat of mixing, DeltaH(1)(infinity), were determined. All the liquids were found to be nonsolvents for poly (2-hydroxy ethyl methacrylate) at 130-150 degreesC. The solubility parameters for PHEMA at infinite dilution were found by plotting the graph of [(delta (2)(1)/RT) - chi (infinity)(12)/VI] versus solubility parameters, delta (1), of these probes. The solubility parameter values of PHEMA found from both the slope and intercept in Fig. 2 are 6.24 (cal/cm(3))(0.5) and 7.08 (cal/cm(3))(0.5) at 140 degreesC.
  • Küçük Resim
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    Determination of thermodynamic properties of poly[2-(3-methyl-3-phenylcyclobutyl)-2-hydroxyethylmethacrylate] and its copolymers at infinite dilution using inverse gas chromatography
    (Elsevier Sci Ltd, 2000) Kaya, İsmet; Demirelli, Kadir
    Some thermodynamic quantities were obtained for the interactions of poly[2-(3-phenylcyclobutyl)-2-hydroxyethylmethacrylate], (PPCHEMA) poly[2-(3-phenylcyclobutyl)-2-hydroxyethylmethacrylate-acrylonitrile] (PPCHEMA-AN) and poly[2-(3-methyl-3-phenylcyciobutyl)-2-hydroxyethylmethacrylate-styrene] (PPCHEMA-S) with alcohols, ketones, acetates, aromatics and alkanes by inverse gas chromatography method in various temperatures. The specific retention volumes, V-g(0), weight fraction activity coefficients of solute probes at infinite dilution, Omega(1)(infinity), Flory-Huggins thermodynamic interaction parameters, chi(12)(infinity), between polymers and solvents are determined. The partial molar free energy, Delta G(1)(infinity), the partial molar heat of mixing, Delta H-1(infinity), at infinite dilution and the solubility parameters of polymer, delta(2), were calculated at various temperatures. The glass transition temperatures, T-g, of PPCHEMA, PPCHEMA-AN and PPCHEMA-S were found to be about 378, 377 and 375 K, respectively, by differential scanning calorimetry. Alcohols, ketones and acetates were found to be good solvent for PPCHEMA and PPCHEMA-AN but n-alkanes and aromatics (except for high temperatures) were found to be non-solvents. Whereas for PPCHEMA-S all solvents were found to be non-solvents at this temperatures. Also the solubility parameters for PPCHEMA, PPCHEMA-AN and PPCHEMA-S at infinite dilution were found by plotting the graph of [(delta(1)(2)/RT) - chi(12)(infinity)/V-1] versus solubility parameters, delta(1), of this probes. (C) 2000 Elsevier Science Ltd. All rights reserved.
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    Öğe
    Determinetion of the thermodynamic properties of poly [ 2-(3-phenyl-3-methylcyclobutyl)-2-hydroxyethyl methacrylate-co-methacrylic acid ] at infinite dilution by inverse gas chromatography
    (2001) Kaya, İsmet; Demirelli, Kadir
    Some thermodynamic quantities were obtained for the interactions of poly [2-(3-phenyl -3- methylcyclobutyl)-2-hydroxyethyl methacrylate-co-methacrylic acid] Poly (PCHEMA-co-MA) with alcohols, ketones, acetates, aromatics and n-alkanes by inverse gas chromatography in the temperature range of 150-180oC. The specific retention volumes, Vgo, weight fraction activity coefficients of solute probes at infinite dilution, $\\Omega 1\\infty$ and Flory-Huggins thermodynamic interaction parameters, $\\chi 12\\infty$ between polymers and solvents were determined. The partial molar free energy, $Delta G1\\infty$ , the partial molar heat of mixing, $Delta H1\\infty$ , at infinite dilution and the solubility parameters of the polymer, $\\delta$2 , were calculated. The copolymer was characterized by 1 H-NMR, FT-IR and DSC analyses
  • Küçük Resim
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    Study of some thermodynamic properties of poly (3,4-di-chloro benzyl methacrylate-co-ethyl methacrylate) using inverse gas chromatography
    (Walter De Gruyter & Co, 2001) Kaya, İsmet; Demirelli, Kadir
    Thermodynamic quantities were obtained for the interactions of poly (3,4-di-chloro benzyl methacrylate-co-ethyl methacrylate) poly (BMA-co- EMA) with alcohols, ketones, acetates, aromatics and alkanes by the inverse gas chromatography method at different temperatures. The specific retention volumes,V-g(o), the sorption enthalpy, DeltaH(1)(s), sorption free energy, DeltaG(1)(s), sorption entropy, DeltaS(1)(s), weight fraction activity coefficients of solute specimens at infinite dilution, Omega (infinity)(1), Flory-Huggins interaction parameters, chi (infinity)(12), between the polymers and solvents were determined. The partial molar free energy, DeltaG(1)(infinity), the partial molar heat of mixing,, at infinite dilution and the solubility parameters of the polymer, delta (2), were calculated at different temperatures. The glass transition temperatures, T-g, of poly (BMA-co-EMA) (18.82,%), poly (BMA-co-EMA) (30:70,%), poly (BMA-co-EMA) (40.60,%) and poly (BMA-co-EMA) (73:27,%) were found to be about 58 degreesC, 59 degreesC, 61 degreesC and 63 degreesC, respectively, as determined by differential scanning calorimetry (DSC). Alcohols, ketones, acetates, n-alkanes and aromatics were found to be nonsolvents for poly (BMA-co-EMA) at this temperatures. Also the solubility parameters for poly (BMA-co-EMA) (18:82,%) and poly (BMA-co-EMA) (40:60,%) at infinite dilution were also found by plotting the graph of [(delta (2)(1)/RT)-chi (infinity)(12)/V-1] versus solubility,parameters, delta (1), of these specimens.