A comparative study of the degradation of poly(methyl methacrylate) (PMMA) films deposited on metal mirrors as a result of heat treatment or irradiation with various UV or γ radiation is presented. The main degradation processes of PMMA during degradation are the random homolytic breakdown of carbon–carbon bonds in the polymer main chain and the photolysis of the lateral methyl groups and lateral esters to form free radicals. All observations on the reflection–absorption spectra are in agreement with the mechanism of PMMA film degradation, subjected to various types of destructive degradation: thermal heating, UV irradiation, or γ irradiation. Unlike other approaches, this one used the reflection–absorption spectra of PMMA thin films deposited on metal mirrors.

进行了比较研究，该热处理是热处理或各种紫外线或γ射线辐照导致沉积在金属镜上的聚甲基丙烯酸甲酯（PMMA）薄膜降解的原因。PMMA在降解过程中的主要降解过程是聚合物主链中碳-碳键的随机均质分解，以及侧甲基和侧酯的光解以形成自由基。关于反射吸收光谱的所有观察结果均与PMMA膜降解的机理一致，并经历了各种破坏性降解：热加热，UV辐射或γ辐射。与其他方法不同，该方法使用了沉积在金属镜上的PMMA薄膜的反射吸收光谱。