Reactive species generated reversibly from a monomer.
Note: Most frequently, the activated monomer is an anionic or cationic species.
Examples: Deprotonated lactam, a protonated cyclic ether, and a Lewis acid coordinated lactone.
See also: cation-activated-monomer polymerization, anion-activated-monomer polymerization, activated-monomer polymerization
Source:
PAC, 2022, 94, 1093. 'Terminology for chain polymerization (IUPAC Recommendations 2021)' on page 1114 (https://doi.org/10.1515/pac-2020-1211)