polyaddition 

https://doi.org/10.1351/goldbook.P04720
A polymerization in which the growth of polymer chains proceeds by addition reactions between molecules of all degrees of polymerization.
Notes:
  1. The growth steps are expressed by: Px+Py→Px+y{x}∈{1,2,…∞};{y}∈{1,2,…∞} where Px and Py denote chains of degrees of polymerization x and y, respectively.
  2. The earlier term 'addition polymerization' embraced both the current concepts of 'polyaddition' and 'chain polymerization', but did not include 'condensative chain polymerization'.
Source:
PAC, 1996, 68, 2287. (Glossary of basic terms in polymer science (IUPAC Recommendations 1996)) on page 2307 [Terms] [Paper]
Citation: 'polyaddition' 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.P04720 RIS BibTex EndNote
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Last revised: February 24, 2014