Term: polymer-poor phase https://doi.org/10.1351/goldbook.P04744 Definition: That phase of a two-phase equilibrium system, consisting of a polymer and low molecular weight material, in which the polymer concentration is lower. The use of the name 'sol phase' is discouraged. Synonymous with dilute phase. Related Terms: 1) molecular weight (http://doi.org/10.1351/goldbook.M04000). 2) sol (http://doi.org/10.1351/goldbook.S05727). Source: Purple Book, 1st ed., p. 68 (http://old.iupac.org/publications/books/author/metanomski.html) Citation: 'polymer-poor phase' 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.P04744 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.