PARTIALLY HALOGENATED HYDROCARBONS CHFCL-CF3, CF3-CH3, CF3-CHF-CHF2, CF3-CH2-CF3, CHF2-CF2-CH2F, CF3-CH2-CHF2, CF3-O-CHF2 - CRITICAL-TEMPERATURE, REFRACTIVE-INDEXES, SURFACE-TENSION AND ESTIMATES OF LIQUID, VAPOR AND CRITICAL DENSITIES

For seven partially halogenated hydrocarbons, designated by the refrig eration industry as the refrigerants R124, R143a, R236ea, R236fa, R245 ca, R245fa, and E125, we determined the critical temperatures T-c (ITS -90), the capillary rise, and the refractive indices of the liquid and vapor phases in the temperature range from 20 degrees C to their crit ical points. Independently measured liquid densities at lower temperat ures, when combined with our refractive indices, produce estimates of the vapor and liquid densities at higher temperatures up to the critic al point. The densities combined with the capillary rise data give the surface tensions, sigma, up to the critical points. The surface tensi ons of the seven refrigerants in this study together with nine others measured previously can be represented by the scaled equation sigma = 2.51(1 + 0.609 omega)k(b)T(c)(N-a/V-c)(2/3)t(1.26)(1 + 0.948t(1/2) - 0 .487t) where t = (T-c - T)/T-c is the reduced temperature, and k(b), N -a, V-c, and omega are the Boltzmann and Avagadro constants, the criti cal volume, and the acentric factor, respectively. This equation yield s values for a within 5% of the measured values for all 16 candidate r eplacement refrigerants.