加成聚合

加成聚合，或稱加聚（Polyaddition，addition polymerisation）^[2][3]是一種通過獨立的加成反應形成聚合物的聚合反應。加成聚合發生在低聚合度的分子之間，這些分子具有不同的功能團，如二聚體、三聚體和低聚物，它們通過反應形成更高分子量的物質。與鏈式聚合不同，加成聚合通常只有在幾乎完全轉化後才會形成聚合物，這一點與縮聚反應相似。^[4]

IUPAC definition

Polyaddition

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 P_x and P_y 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'.^[1]

典型的加成聚合反應是合成聚氨酯。