MEASUREMENTS OF (P,RHO,T,X) FOR (X CS2-X) SI(CH3)4)(1) FROM 198 TO 298-K AND PRESSURES UP TO 104 MPA - EXPERIMENTAL RESULTS AND DERIVED THERMODYNAMIC PROPERTIES((1)

Molar densities have been measured by using an expansion technique at pressures up to 104 MPa and temperatures from 198 to 298 K for the mix ture {x CS2 + (1-x) Si(CH3)4}(1) over the whole composition range. Sev eral thermodynamic properties (isothermal compressibility, thermal exp ansivity, and molar internal energy, enthalpy and entropy increments r elative to liquid at saturation) have been directly obtained from the experimental densities. The isothermal compressibility and the thermal expansivity are both smooth functions of pressure, temperature and co mposition, although the isotherms of the thermal expansivity exhibit a characteristic crossover at high pressures. The intersection of isoth erms of thermal expansivity seems to occur at a single point of the (p ,alpha(p)) diagram, showing a nearly linear dependence with the compos ition.