Thermochemical Properties of Phase Transitions and Solvation for Some Mono- and Di-cyanate Esters at 298.15 K

Abstract

We have obtained the thermochemical properties of the phase transition of six mono- and di-cyanate esters for the first time. Vapor pressure–temperature dependences and enthalpies of vaporization for two mono-cyanate esters were measured by fast scanning calorimetry and transpiration method. Fusion enthalpies of cyanate esters were studied by differential scanning calorimetry. We have developed an additive scheme for the evaluation of solvation enthalpies of cyanate esters based on the reliable data of solution and sublimation enthalpies of one mono-cyanate ester. The proposed scheme and experimental solution enthalpies in different solvents were further used for the determination of the vaporization and sublimation enthalpies of other cyanate esters at 298.15 K.