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Some thermodynamic quantities were obtained for the interactions of poly (4-tert-butylstyrene) with alcohols, ketones, acetates, aromatics and alkanes by the inverse gas chromatography method in the temperature range of 343-463 K. The specific retention volumes (Vg°), the adsorption enthalpy of probes (ΔH 2 ), the partial molar free energy of sorption (ΔG 1  S ), the enthalpy of sorption (ΔH 1  S ), the entropy of sorption (ΔS 1  S ), the weight fraction activity coefficients of solute probes at infinite dilution (Ω 1  ∞ ), and the Flory- Huggins thermodynamic interaction parameters (χ ∞  12 ) between polymer and solvents are given. The partial molar free energy (ΔG 1  ∞ , the partial molar heat of mixing (ΔH 1  ∞  at infinite dilution and the solubility parameters of the polymer (δ 2 ) were calculated. The solubility parameter of poly (4-tert-butyl- styrene) was determined from either the slope or intercept as 7.25 (cal/cm 3 ) 0,5  and 7.00 (cal/cm 3 ) 0,5  at 180°C, respectively.

Determination of Thermodynamic Properties of Poly(4-tert-Butylstyrene) by Inverse Gas Chromatography