反气相色谱法测定聚环己基丙烯酸甲酯的热力学性质（英文）

Determination of thermodynamic properties of poly(cyclohexyl methacrylate)byinverse gas chromatography

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(V0g)was determined for each probe molecule.By using(1/T;ln V0g)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(ΔHS1),partial molar free energy of sorption(ΔGS1)and partial molar entropy of sorption(ΔSS1)belonging to sorption for every probe were calculated.The partial molar heat of mixing at infinite dilution(ΔH∞1),partial molar free energy of mixing at infinite dilution(ΔG∞1),Flory-Huggins interaction parameter(χ∞12)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.

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（Vg^0）was determined for each probe molecule.By using（1/T;ln V0g）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（ΔH1^S）,partial molar free energy of sorption（ΔG1^S）and partial molar entropy of sorption（ΔS1^S）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.