Processes that occur in a @P04739@ 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]
Cite as: IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). Online version (2019-) created by S. J. Chalk. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.