089 Effect of electron beam irradiation on polyimide film for aerospace material
Phil-Hyun Kang*, Joon-Pyo Jeun, Young-Kyu Jeon: Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup-si, Jeollabuk-do, Republic of Korea
E-Mail: phkang@kaeri.re.kr
Abstract
Aromatic polymers are used for heat resistant materials and are expected to be used under severe conditions such as those in space. So the radiation resistance of aromatic polymers was studied by ion irradiation. Polyimides were extensively studied and reported having excellent resistivity for gamma rays and electron beam irradiation. In this study, electron beam irradiation effects on the dynamic mechanical properties of polyimide were investigated. Irradiation was carried out by use of electron beam up to 15 MGy. The temperature dependence of the tan ï¤ proved the presence of two relaxations; a ï¢2 relaxation located around 100 oC and a glass relaxation located around 400 oC. By increasing the radiation dose, distinguished shift of the ï¢2 relaxation temperatures was observed. Electron beam irradiation on the polyimide led to decrease in the decomposition temperature and char yield.
Keywords: Polyimide; Electron beam; Dynamic mechanical analysis; tan delta