ქიმიის ტერმინთა განმარტებითი ლექსიკონი

Parameter used in predicting the solubility of non-electrolytes (including polymers) in a given solvent. For a substance B ,

where Δ_vapE_m,B is the molar energy of vaporization at zero pressure and V_m,B  is the molar volume.

Notes:

1. For a substance of low molecular weight, the value of the solubility parameter can be estimated most reliably from the enthalpy of vaporization and the molar volume.
2. The solubility of a substance B can be related to the square of the difference between the solubility parameters for supercooled liquid B and solvent at a given temperature, with appropriate allowances for entropy of mixing. Thus, a value can be estimated from the solubility of the solid in a series of solvents of known solubility For a polymer, it is usually taken to be the value of the solubility parameter of the solvent producing the solution with maximum intrinsic viscosity or maximum swelling of a network of the polymer.
3. The SI units are Pa^1/2=J^1/2 m^−3/2, but units used frequently are (μPa^)1/2=(J cm⁻³)^1/2 or (cal cm⁻³)^1/2 , where 1 (J cm⁻³)^1/2 ≈2.045 (cal cm⁻³)^1/2.  The unit calorie is discouraged as obsolete.