Term: partially draining https://doi.org/10.1351/goldbook.P04414 Definition: An adjective describing a chain macromolecule that behaves in a hydrodynamic field as though the solvent within the domain of the macromolecule were progressively more immobilized with respect to the macromolecule in the direction from its outer fringes inward. A freely draining macromolecule and a non-draining macromolecule are two extremes of the concept of a partially draining macromolecule. Related Terms: 1) freely draining (http://doi.org/10.1351/goldbook.F02516). 2) non-draining (http://doi.org/10.1351/goldbook.N04191). Source: Purple Book, 1st ed., p. 61 (http://old.iupac.org/publications/books/author/metanomski.html) Citation: 'partially draining' 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.P04414 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.