Study On Enthalpy Of Vaporization And Polarity For Ether-functionalized Imidazolium Ioinc Liquids

The-ionic-liquids,1-methoxyethyl-3-methylimidazoliumbis?trifluoromethylsulfo ny?-imide[MOEmim][NTf₂],1-ethoxyethyl-3-methylimidazoliumbis?trifluoro-methyls ulfony?imide [EOMmim][NTf₂],were prepared firstly by the neurealization method.Then confirmed by ¹H-NMRspectroscopy,¹³C-NMR spectroscopy,thermogravimetric?TGA?.In the past research,the vaporization enthalpy of ionic liquid tested by TGA method.Somebody questions that the inonic liquids have decomposed in the high temperature period.The new idea of the paper is the TG-IR with the same experimental conditions TGA,tested the infrare spectra of the each segment temperature gas.Compared the infrared spectra of different tempertures,prove that the ionic liquid didnot decompose.The difference of heat capacities between the vapor phase and the liquid phase,?₁^gC_p^o m,for the ionic liquids were calculated based on the statistical thermodynamics,and then in terms of ?₁^gC_p^o m,the values of ?₁^gH_m^o (T_av)can be transformed into ?₁^gH_m^o?298?.In terms of Hildebrand theory,the new scale of polarity for ILs was put forward base on the values of enthalpies of vaporization,and the order of the polarity of the ILs is also predicted.Besides,vaporization enthalpy,Gibbs energy,entropy vaporization of ionic liquid at different temperatures were also calculated.