Mediating agent in
stable-radical-mediated radical polymerization with sufficient kinetic stability such that it is essentially unreactive towards addition to monomer under the conditions of the experiment.
Note: The stable radical
mediating agent need not be thermodynamically stable
See: stable-radical-mediated radical polymerization, chain activation
Source:
PAC, 2022, 94, 1093. 'Terminology for chain polymerization (IUPAC Recommendations 2021)' on page 1125 (https://doi.org/10.1515/pac-2020-1211)