自由基捕获剂是一类具有空间位阻效应的哌啶行生物类光稳定剂，主要为受阻胺类,其稳定效能比上述的光稳定剂高几倍,是公认的高效光稳定剂。加入高分子材料中能抑制或减缓光氧化过程的物质称光稳定剂或紫外光稳定剂。常用的光稳定剂根据其稳定机理的不同可分为紫外线吸收剂、光屏蔽剂和紫外线猝灭剂、自由基捕获剂等。
溴使树脂热解过程成碳倾向增加，分解生成的溴化氢是有效的自由基捕获剂。
In the meanwhile, bromine element can increase the char-residue and the HBr created by the pyrolysis of the resin can also act as a radical scavenger.
根据光稳定剂作用机理的不同，将光稳定剂分为光屏蔽剂、紫外线吸收剂、激发态猝灭剂及自由基捕获剂。
Based on different action principle, light stabilizers were defined as ultraviolet light screening agent, ultraviolet absorbent, quencher and free radical catching agent.
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