cationic ring-opening polymerization

https://doi.org/10.1351/goldbook.08984
Cationic polymerization in which a cyclic monomer yields a monomeric unit that is either acyclic or contains fewer rings than the cyclic monomer.

Examples: Monomers used in cationic ring-opening polymerization are cyclic ethers, lactones and lactams.

Source:
PAC, 2022, 94, 1093. (Terminology for chain polymerization (IUPAC Recommendations 2021)) on page 1130 [Terms] [Paper]