Main Page | See live article | Alphabetical index In polymer chemistry, ring-opening polymerization is similar to addition polymerization in that an end of a growing chain acts as a reactive center upon which other monomers can react with to propagate the chain. In ring-opening polymerization, the monomer is a cyclic compound. The chain typically propagates through cationic or anionic propagation. This article is a stub. You can help Wikipedia by fixing it. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.