PVT Properties of Dimethyl (isopropenylethynyl) carbinol at Temperatures from 293 to 363K and Pressures from 0.1 to 350 MPa, Studied Using the Micro-PVT System

摘要

The effect of pressure on the volume of dimethyl(isopropenylethyny)carbinol, (CH_3)_2C(OH)C ident to CC(CH_3) = CH_2, has been measured over the pressure range (0.1 to 350)MPa and the temperature range (293.15 to 363.15)K using the Micro-PVT system, a new universal instrument for measuring the thermodynamic characteristics of materials. Experimental data on the variation of the volveme ratio K - V_p/V_o (V_p = sample volume at given pressure P; V_0 = sample volume at 0.1 MPa) with pressure have been approximated by two equations allowing the interpolation and extrapolation of experimental data with an acceptable uncertainty. The temperature dependence of the coefficients of the Tait equation has been studied. enabling the calcuation of the volume ratio with an acceptable uncertainty for a wider temperature and pressure range. The isothermal compressibility, the isobaric thermal expansivity, and the increment of isobaric molar heat capacity from its value at 0.1 MPa have been calculated using the experimental data obtained.