Density, vapor pressure, enthalpy of vaporization and heat capacity of (E)-isobutyl cinnamate

The density of (E)-isobutyl cinnamate at 297.95-535.20 K was measured using a capillary pycnometer and linearly related to temperature. The vapor pressure of (E)-isobutyl cinnamate at 420.15-570.05 K was measured by the ebulliometric method, and correlated by Antoine equation with an average relative deviation of 1.11 %. The vaporization enthalpy Delta vapH (Tb) of (E)-isobutyl cinnamate at normal boiling point was obtained based on the Clausius-Clapeyron equation. The standard vaporization enthalpy Delta vapH (298.15 K) was calculated to be 73.67 +/- 0.5 kJ & sdot;mol- 1 by Othmer's method and verified by the Corresponding State Group Contribution (CSGC) method. The heat capacities at saturation vapor pressure (CSL) of (E)-isobutyl cinnamate were measured at 298.15-533.15 K by an automatic calorimeter and correlated by a quadratic polynomial.