Internal pressures and solubility parameters for carbon disulfide, benzene, and cyclohexane

Abstract

Densities of carbon disulfide, benzene, and cyclohexane were measured in the region 23-65 °C at pressures to 1 kbar. The data were used to calculate internal pressures and these were compared with solubility parameters obtained from liquid molar volumes at saturation and isothermal energies of vaporization to the ideal-gas state. Along the saturation line, the square root of the internal pressure is somewhat larger than the solubility parameter (square root of cohesive energy density). For benzene and cyclohexane the internal pressure decreases with temperature while the reverse holds true for carbon disulfide. As the external pressure rises, the internal pressures Supplementary Material Available: Tables containing all experimental volumetric data (6 pages). Ordering

Solubility of polyvinyl alcohol in supercritical carbon dioxide and subcritical 1,1,1,2-tetrafluoroethane

“…(3) should equal to be unity for nonpolar and nonassociating materials, as well as for polar materials where the dipole moment was less than 2 D; in addition, Jack et al [52,53] strongly suggested that the value of m for CO 2 should be near unity. Therefore, the internal pressure and cohesive energy density of CO 2 in Eq.…”

Secondary transitions in amorphous polymers. 5. Linear form of the Tait equation applied to isotactic poly(methyl methacrylate)

“…The Tait equation has been used extensively in recent years to represent volume-pressure isotherms on poly-mers1" 13 and low molecular weight liquids. 14,15 In its integrated form, it is usually quoted as 1 -V/V0 = C'ln (1 + P/b) (1) where V is the specific volume in cm3/g at pressure P, and V0 is the corresponding volume at the reference pressure P = 0 bar. (Some authors use a reference pressure of P0 = 1 bar,14 but more generally, it is given as P0 = 0 bar, even in cases where the tabulated data begin at P = 1 bar.9) C is taken as a universal constant, having a value of 0.0894, as defined by Simha et al5"10 The parameter b is a constant along any isotherm for which there is no pressureinduced transition.…”

Prediction of Internal Pressure of Binary Liquid Mixtures Using Flory's Statistical Theory

“…[22][23][24][25][26][27][28] Using the reported ultrasonic speed, u, and density, ρ, data of liquid mixtures internal pressure have been calculated experimentally using Eqn (1). Internal pressure using Flory's statistical theory has been computed by putting the required parameters of pure components (Table 1) and reported mole fractions of the liquid mixtures in Eqn (6).…”

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