Surface and structural changes in polyimide by 100 MeV Ag7+ ion irradiation

Ion beam induced surface and interface engineering

“…Ion beam irradiation effect on polyimide has also been studies by Kudo et al and Mathakari et al The contact angle was found to decrease from the pristine value of 82°-43°at the maximum fluence of 5 × 10 12 ions/cm 2 as shown in Fig. 6.25 [622,623].…”

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

“…[1][2][3] The applications include shielding materials, thermal blankets, solar sails and arrays that depend on its reliable thermal stability and performance. [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.…”

Changes in Surface Free Energy and Surface Conductivity of Carbon Nanotube/Polyimide Nanocomposite Films Induced by UV Irradiation

“…Before irradiation, water contact angle values for both films (with and without CNTs) were essentially the same: 72.1 ± 8.8°for PI films and 70.6 ± 4.9°for CNT/PI films. Due to the imide group in the PI, the polar interaction with water is higher than for epoxies, whose contact angle with water is 99°as reported by Clausi et al 19 After exposure to UV-C, the water contact angles for all films decreased, indicating a change in PI surface chemistry after exposure to UV accompanied by an increase in the surface energy due to increasing polarity as observed by Dhole et al 20 In particular, for PI films and CNT/PI films, the water contact angle after UV-C exposure decreased to 44.7 ± 2.5 and 53.7 ± 1.8°, a drop of ca. 38 and 24%, respectively.…”