polymer cyclization

Chemical reaction that leads to the formation of ring structures in or from polymer chains.
  1. Examples of @C01494@ along polymer chains are: (a) @C01494@ of polyacrylonitrile, (b) acetalization of poly(vinyl alcohol) with an aldehyde, (c) @C01494@ of polymers of conjugated @D01699@, such as polyisoprene or polybutadiene, leading to macrocycles.
  2. Examples of @C01494@ of polymer molecules are: (a) @C01494@ of poly(dimethylsiloxane), (b) back-biting reaction during ionic polymerizations of heterocyclic monomers.
PAC, 2004, 76, 889. (Definitions of terms relating to reactions of polymers and to functional polymeric materials (IUPAC Recommendations 2003)) on page 893 [Terms] [Paper]