extraction fractionation

of polymers
A process in which a @[email protected] material, consisting of macromolecules differing in some characteristic affecting their @[email protected], is separated from a @[email protected] into fractions by successively increasing the solution @[email protected] of the solvent, resulting in the repeated formation of a two-phase system in which the more soluble components concentrate in the @[email protected]
Purple Book, 1st ed., p. 68 [Terms] [Book]