Term: precipitation fractionation
https://doi.org/10.1351/goldbook.P04796

Definition:
A process in which a macromolecules material, consisting of macromolecules differing in some characteristic affecting their solubility, is separated from solution into fractions by successively decreasing the solution power of the solvent, resulting in the repeated formation of a two-phase system in which the less soluble components concentrate in the polymer-rich phase.

Related Terms:
1) macromolecules (http://doi.org/10.1351/goldbook.M03667).
2) solubility (http://doi.org/10.1351/goldbook.S05740).
3) power (http://doi.org/10.1351/goldbook.P04792).
4) polymer-rich phase (http://doi.org/10.1351/goldbook.P04745).

Source: Purple Book, 1st ed., p. 68 (http://old.iupac.org/publications/books/author/metanomski.html)

Citation: 'precipitation fractionation' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.P04796

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