A polycondensation reaction is a type of step-growth polymerization in which monomers react to form a polymer with the loss of a small molecule, such as water or methanol. The monomers typically have two or more functional groups that can react with each other. Polycondensation reactions are used to synthesize a variety of polymers, including polyesters, polyamides, and polycarbonates.

聚缩合反应是一种逐步增长聚合，其中单体反应形成聚合物，并损失一个小分子，例如水或甲醇。单体通常具有两个或多个可以相互反应的官能团。聚缩合反应用于合成各种聚合物，包括聚酯、聚酰胺和聚碳酸酯。