氟橡胶F2311辐射降解气体产物研究

STUDY ON GAS PRODUCTS OF FLUORORUBBER F2311 AFTER RADIATION DEGRADATION

氟橡胶F2 311在真空、氮气、空气 3种气氛条件下经 5 0kGy以上剂量的γ射线辐照发生了降解反应 ,辐射降解产生的气体用GC -MS分析 ,气体水溶液用离子选择性电极、原子吸收光谱等方法进行了测试。结果表明 ,H2 (在空气气氛中除外 )、HF、HCl、CO2 的量随剂量的增加而增大 ;氮气的存在对F2 311的辐射降解反应具有一定的抑制作用 ;在空气气氛中剂量达到 5 0 0kGy时产生H2 的量为最大 ,剂量再增加时逐渐减小。测定了 3种气氛中辐射降解气体的G值及总分解率。

ray radiation degradation of Fluororubber F2311 could take place above 50kGy at the atmosphere of vacuum, nitrogen and air. The gas contents from radiation degradation were analyzed by GC-MS. In addition, they were dissolved in water and analyzed by ion selective electrode and atomic absorption spectrometry(AAS). The results were as follows: the yields of H 2(except in the air)?HF?HCl and CO 2 got rise with the dose raising; nitrogen had some inhibiting effect on radiation degradation of fluororubber F2311; the product of hydrogen was the most at the dose of 500kGy in air, and that would reduce with the dose. G value and the gross decomposition ratio of gas from F2311 after irradiation in three kinds of atmosphere were determined.