A study on the free-radical evolution and its correlation with the optical degradation of 170 keV proton-irradiated polyimide

作者：Wu Yiyong; Sun Chengyue^*; Xiao Jingdong; Li Ruifeng; Yang Dezhuang; He Shiyu

来源：Polymer Degradation and Stability, 2010, 95(7): 1219-1225.

DOI：10.1016/j.polymdegradstab.2010.03.033

• Polyimide
• Free radical
• Optical transmittance
• Degradation evolution

In this paper, the damage process was investigated on the 170 keV proton-irradiated polyimide, based on the evolution of free radical and its correlation with degradation of the optical transmittance using electron paramagnetic resonance (EPR) and optical-transmittance measurements. The results indicate that the g value of irradiated free radicals keeps at a constant of 2.0025 but the spectral intensity of the free radicals increased with the increasing proton fluence. It is found that during the post-storage after irradiation, the concentration of free radical decreased in an exponential rule with the post-storage time and the free-radical stability can be defined by the corresponding time constant at around 2.3 h. It is interested that the recovery of optical-transmittance follows the same mode as that of free radicals. The mechanisms on the free-radical evolution and the correlation between free radical and optical property are discussed in the paper.

• 出版日期2010-7
• 单位哈尔滨工业大学