aging (ageing) 

of a polymer
https://doi.org/10.1351/goldbook.AT06849
Processes that occur in a polymeric material during a specified period of time, and that usually result in changes in physical and/or chemical structure and the values of the properties of the material.
Source:
PAC, 1996, 68, 2313. (Definitions of terms relating to degradation, aging, and related chemical transformations of polymers (IUPAC Recommendations 1996)) on page 2315 [Terms] [Paper]
Citation: 'aging' 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.AT06849 RIS BibTex EndNote
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Last revised: October 7, 2008