Title: impermeable
Long Title: IUPAC Gold Book - impermeable
DOI: 10.1351/goldbook.12255
Status: current

Definition
Adjective describing the flow behaviour of a macromolecule in solution or a dispersed entity when, due to hydrodynamic interaction, the solvent or dispersion medium within the domain of the macromolecule or dispersed entity is essentially immobilised and moves with the dissolved macromolecule or dispersed entity.

Related Term
- hydrodynamic interaction: https://goldbook.iupac.org//terms/view/12253

Source
- PAC, 2015, 87, 71. 'Definitions of terms relating to individual macromolecules, macromolecular assemblies, polymer solutions, and amorphous bulk polymers (IUPAC Recommendations 2014)' on page 102 (https://doi.org/10.1515/pac-2013-0201)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/12255/html
- json: https://goldbook.iupac.org/terms/view/12255/json
- xml: https://goldbook.iupac.org/terms/view/12255/xml

Citation: Citation: 'impermeable' 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.12255
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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: 2026-04-18T01:46:39+00:00