Photooxy-degradation(aging) will happen to polymer when they accept UV-irradiation of the sun especially weak bond or unsaturated bond as diolefine exist in macromolecular chain.

• 聚合物尤其是存在弱链键和双烯结构的大分子链,在接受太阳紫外线辐射后,易发生光诱发的氧化降解反应(老化)。