Insertion polymerization

{
  "id": "MLC-T-CHM-005898",
  "term": "Insertion polymerization",
  "field": "Chemistry",
  "definition": "A chain polymerization in which each monomer first coordinates to a metal centre and then inserts into the bond joining the metal to the growing chain, so the chain end stays attached to the metal. It is the mechanism of Ziegler-Natta and metallocene catalysis of olefins. Stereoselective catalysts give isotactic or syndiotactic polypropylene, whereas polyethylene has no stereocentres to control.",
  "synonyms": [
    "polyinsertion"
  ],
  "subject": "Polymer",
  "see_also": [
    "reversible-addition-fragmentation chain-transfer polymerization",
    "aminoxyl-mediated radical polymerization",
    "coordination polymerization",
    "coordination-insertion polymerization",
    "reversible-deactivation radical polymerization"
  ],
  "references": [
    "PAC, 2022, 94, 1093. 'Terminology for chain polymerization (IUPAC Recommendations 2021)' on page 1101 (https://doi.org/10.1515/pac-2020-1211)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/insertion-polymerization/"
}