Term: polymer membrane https://doi.org/10.1351/goldbook.PT07188 Definition: Thin layer of polymeric material that acts as a barrier permitting mass transport of selected species. Related Terms: 1) membrane (http://doi.org/10.1351/goldbook.MT06878). 2) polymeric (http://doi.org/10.1351/goldbook.M03667). Source: PAC, 2004, 76, 889. 'Definitions of terms relating to reactions of polymers and to functional polymeric materials (IUPAC Recommendations 2003)' on page 902 (https://doi.org/10.1351/pac200476040889) Citation: 'polymer membrane' 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.PT07188 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.