A quenching agent is a substance that stops a chemical reaction, often by reacting with the active species involved in the reaction. In polymerization, quenching agents can be used to terminate the polymerization process or to prevent unwanted side reactions. Quenching agents can be added intentionally to control the molecular weight or to stop the reaction at a specific point.

淬灭剂是阻止化学反应的物质，通常通过与参与反应的活性物质发生反应来实现。在聚合中，淬灭剂可用于终止聚合过程或防止不需要的副反应。可以有意添加淬灭剂来控制分子量或在特定点停止反应。