Thermodynamics of benzene sorption in polyethylene oxide
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The solubility of benzene in poly(ethylene oxide) has been determined using the piezoelectric sorption method at 64.5Â°C, 70.6Â°C and 74.6Â°C over the concentration range 3 to 36 wt % benzene. The solubility results determined in this study are in excellent agreement with those obtained by a static method at 70Â°C and by gas-liquid chromatography at 75.1Â°C. The weight fraction activity coefficient of benzene varies directly with temperature and inversely with increasing benzene concentration. The activity data of benzene are well correlated by the corresponding-states solution theory of Prigogine and Flory. The observed negative partial molar enthalpy of benzene indicates that the poly(ethylene oxide)-benzene solution is exothermic at 67.55Â°C and 72.6Â°C. Negative partial molar entropy of benzene, observed in the poly(ethylene oxide)-benzene solution at 67.55Â°C and 72.6Â°C, indicates ordering in the solution.