{"term":{"id":"14262","title":"confined-spaces crystallisation","longtitle":"IUPAC Gold Book - confined-spaces crystallisation","doi":"10.1351\/goldbook.14262","code":"14262","status":"current","definitions":[{"id":1,"text":"Polymer crystallization occurring inside elongated cavities, spheres, galleries, or layers formed by a host material different from the polymer.","notes":{"1":"Morphology and polymorphism may be significantly affected by confined crystallization.","2":"At least one dimension of the cavities must be of the order of a few nanometers, i.e., close to typical dimensions of a polymer crystallite and, in particular, to lamellar thickness.","3":"Stems may be isolated in the cavities of the frequently nonpolymeric host material, as in the cases of zeolites and the fully trans-form of perhydrotriphenylene in the crystalline state. In such cases, the polymer stems are usually highly disordered.","4":"Stems may aggregate in small, disordered bundle crystals or in relatively large lamellar crystals, typically within layered inorganic materials.","5":"Spherical structures may result from the crystallization of one of the two components in a heterogeneous polymer blend (e.g., in a polyethylene-polycarbonate blend) while lamellar, hexagonally packed cylindrical and inverse cylindrical morphologies are frequent in block copolymers with a crystallizable block (e.g., in poly(ethylene oxide)-block-polystyrene))."},"links":[{"term":"bundle crystals","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/14248"}],"sources":["PAC, 2011, 83, 1831. 'Definitions of terms relating to crystalline polymers (IUPAC Recommendations 2011)' on page 1860 (https:\/\/doi.org\/10.1351\/PAC-REC-10-11-13)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/14262\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/14262\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/14262\/plain"},"citation":"Citation: 'confined-spaces crystallisation' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351\/goldbook.14262","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.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","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.","accessed":"2026-04-27T17:45:38+00:00"}}