chain activation

in SRMP
synonyms: activation (in SRMP), unimolecular activation, unimolecular chain activation
https://doi.org/10.1351/goldbook.08941

Unimolecular dissociation of a dormant species to form a mediating agent and a propagating species.

Notes:
  1. In aminoxyl-mediated radical polymerization [nitroxide-mediated polymerization (NMP)], the dormant species is an alkoxyamine and the mediating agent is an aminoxyl radical.
  2. In organometallic-mediated radical polymerization (OMRP), the domant species and the mediating agent are organometallic species.
  3. In reversible addition-fragmentation radical polymerization (RAFRP), the dormant species is a stable radical and the mediating agent is a non-propagating olefin, e.g., 1,1-diphenylethylene.
  4. Chain deactivation (in SRMP) is the reverse of chain activation (in SRMP).
Source:
PAC, 2022, 94, 1093. 'Terminology for chain polymerization (IUPAC Recommendations 2021)' on page 1117 (https://doi.org/10.1515/pac-2020-1211)