Term: polymer cyclization
https://doi.org/10.1351/goldbook.PT07143

Definition:
Chemical reaction that leads to the formation of ring structures in or from polymer chains.

Notes:
0) 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.
1) Examples of @C01494@ of polymer molecules are: (a) @C01494@ of poly(dimethylsiloxane), (b) back-biting reaction during ionic polymerizations of heterocyclic monomers.

Related Terms:
1) cyclization (http://doi.org/10.1351/goldbook.C01494).
2) dienes (http://doi.org/10.1351/goldbook.D01699).

Source: PAC, 2004, 76, 889. 'Definitions of terms relating to reactions of polymers and to functional polymeric materials (IUPAC Recommendations 2003)' on page 893 (https://doi.org/10.1351/pac200476040889)

Citation: 'polymer cyclization' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.PT07143

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