6MeV pulsed electron beam induced surface and structural changes in polyimide

Surface characterization and degradation behavior of polyimide films induced by coupling irradiation treatment

“…[4][5][6] When exposed to damaging environments with effects of protons, electrons, solar ultraviolet radiation or thermal cycling, the microstructure and properties of polyimide will strongly be affected and tends to degrade gradually, which will lead to reducing the reliability of components in spacecra or even mission failure. [7][8][9][10][11][12][13] Consequently, it is important to gure out the degradation behavior and mechanism of polyimide under these threatening environments.…”

Polyimide: From Radiation-Induced Degradation Stability to Flat, Flexible Devices

“…Upon irradiation, both scission and cross-linking take place in polymer simultaneously, and depending upon polymer, radiation type, and amount of dose rate scission and cross-linking, one or the other may dominate. From the obtained results, Mathakari et al [64] were of the opinion that in their case cross-linking had dominated over scissioning. The dose rate of 6 MeV electrons was additionally high $2000 kGy/h.…”

“…For 6 MeV irradiation, Mathakari et al [64] used a PI sheet with a density $ 1.43 gm/cm 3 and thickness of 50 μm. The sheet was cut into pieces of size 100 mm  15 mm  50 μm for stress-strain studies.…”

Review of Radiation-Induced Effects in Polyimide

“…Mathakari et al [127] reported a 22%, 120%, and 199% increase in tensile strength, elongation, and Young's modulus, respectively, for PI material irradiated with a 6 MeV pulsed electron beam at a maximum fluence of 4 × 10 15 electrons/cm 2 . Low-energy (8 keV-40 keV) electron irradiation of the similar material at the maximum fluence of 1 × 10 16 electron/cm 2 resulted in 11% and 8% decrease in tensile strength and elongation, respectively [128][129][130].…”