Term: switchboard model https://doi.org/10.1351/goldbook.S06204 Definition: A model of crystallinity in which the crystallized segments of a macromolecule belong to the same crystal, although the stems are connected randomly. Related Terms: 1) crystallinity (http://doi.org/10.1351/goldbook.C01433). Source: Purple Book, 1st ed., p. 84 (http://old.iupac.org/publications/books/author/metanomski.html) Citation: 'switchboard model' 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.S06204 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.