Preferred Label : solubility parameter;
Detailed label : solubility parameter, δ;
IUPAC definition : Parameter used in predicting the solubility of non-electrolytes (including polymers)
in a given solvent. br/ For a substance B, \[Δ _{{B}} \left ( \frac{Δ _{{vap}}E_{{m,B}}}{V_{{m,B}}}
\right ) {1/2}\] where Δvap.Em,B is the molar energy of vaporization at zero pressure
and Vm,B is the molar volume.;
Scope note : the si units are pa1/2 j1/2 m-3/2 , but units used frequently are
µpa1/2 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.; 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 parameter.
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. see j.h. hildebrand, r.l.scott, the solubility of nonelectrolytes,
3rd ed., reinhold publishing (1950); dover publications (1964), chap. vii, p.129;
chap. xxiii, for the original definition, theory, and extensive examples.; 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.;
Origin ID : ST07466;
See also
Parameter used in predicting the solubility of non-electrolytes (including polymers)
in a given solvent. br/ For a substance B, \[Δ _{{B}} \left ( \frac{Δ _{{vap}}E_{{m,B}}}{V_{{m,B}}}
\right ) {1/2}\] where Δvap.Em,B is the molar energy of vaporization at zero pressure
and Vm,B is the molar volume.
