在密闭的氮气气氛下,用伽马射线辐照聚二甲基硅橡胶泡沫,采用全反射红外光谱(ATR)和X射线光电子能谱(XPS)对辐照后的化学结构和元素含量变化进行了表征。结果表明:化学结构单元Si—CH3最容易受到伽马射线的影响,在低的辐照剂量下表面Si—CH3成分随着辐照剂量增加而减小;高剂量下材料的元素分布发生了变化,近表面C元素含量要比泡沫体中部的C元素含量高。因此,在密闭环境下辐照老化后的硅橡胶泡沫的表面性能和体内性能存在差异。 Polyurethane foam was irradiated with gamma rays in a closed nitrogen atmosphere. The chemical structure and elemental content after irradiation were characterized by total reflection infrared (ATR) and X-ray photoelectron spectroscopy (XPS) Characterization. The results show that Si-CH3, the chemical structure unit, is the most susceptible to gamma rays. The Si-CH3 content decreases with the increase of irradiation dose at low irradiation dose. The elemental distribution of Si-CH3 decreases with the increase of dose , Near the surface of the C element content than the middle of the foam C element content is high. Therefore, there is a difference in the surface properties and in vivo performance of irradiated silicone rubber foams under airtight conditions.