File:IUPAC definition for chain polymerization.png
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Summary[edit]
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English: A chain reaction in which the growth of a polymer chain proceeds exclusively by reaction(s) between monomer(s) and reactive site(s) on the polymer chain with regeneration of the reactive site(s) at the end of each growth step.
A chain polymerization consists of initiation and propagation reactions, and may also include termination and chain transfer reactions. The adjective 'chain' in 'chain polymerization' denotes a 'chain reaction' rather than a 'polymer chain'. Propagation in chain polymerization usually occurs without the formation of small molecules. However, cases exist where a low-molar-mass by-product is formed. The term 'chain polymerization' may be qualified further, if necessary, to specify the type of chemical reactions involved in the growth step, e.g. ring-opening chain polymerization, cationic chain polymerization. There exist, exceptionally, some polymerizations that proceed via chain reactions that, according to the definition, are not chain polymerizations. The growth step, however, involves reactions between molecules of all degrees of polymerization and, hence, the polymerization is classified as a polyaddition. If required, the classification can be made more precise and the polymerization described as a chain-reaction polyaddition. |
| Date | |
| Source | International Union of Pure and Applied Chemistry (IUPAC) |
| Author | International Union of Pure and Applied Chemistry (IUPAC) |
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