Abstract:To investigate the influence of space irradiation on the properties of J312L structural adhesive, micromorphology, molecular structure, heat resistance, vacuum pollution and mechanical properties of J312L were analyzed by SEM, FT-IR, XPS, TGA, DSC, vacuum outgassing and mechanical test. The irradiation aging mechanism of material was investigated. The results show that the total dose irradiation has a significant effect on the thermal stability, vacuum outgassing and mechanical properties of J312L adhesive. After 1.5×109 rad(Si) γ-ray irradiation from 60Co, the tensile shear strength is 4.8 MPa, and the total vacuum mass loss (TML) is 2.36%. Compared to that of the initial, the glass transition temperature and the thermal decomposition temperature (Td 5%) are reduced by 31 ℃ and 84 ℃, respectively, indicating that the J312L adhesive is dominated by the degradation reactions within high-dose radiation.