Investigation on the radiation induced conductivity of space-applied polyimide under cyclic electron irradiation

Long, Yue; Wu, Yiyong; Sun, Chuang; Xiao, Jing; Shi, Yaping; Ma, Guoliang; He, Song

doi:10.1016/j.nimb.2012.09.008

Cited by 13 publications

(7 citation statements)

References 28 publications

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“…The dipole polarization is closely related to the relaxation process of the corresponding groups within the molecular features, and highly polarized groups in the molecular chain of polyimide, which can dominate this dipole polarization process. Tables 3 and 4 show the typical molecular dipole moment and polarizability of the functional groups of the polyimide [25]. It can be seen that the groups C=O, C-O, and C-N have high polarizability and dipole moment, so electron density is concentrated around carbon, whereas oxygen and nitrogen are depleted in the condition of external field; these groups have strong polarization and corresponding relaxation phenomenon.…”

Section: Discussionmentioning

confidence: 99%

Low Dielectric Constant Polyimide Obtained by Four Kinds of Irradiation Sources

Yang

Tian

et al. 2020

Polymers

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Irradiation is a good modification technique, which can be used to modify the electrical properties, mechanical properties, and thermal properties of polymer materials. The effects of irradiation on the electrical properties, mechanical properties, and structure of polyimide (PI) films were studied. PI films were irradiated by a 1 MeV electron, 3 MeV proton, 10 MeV proton, and 25 MeV carbon ion. Dielectric constant, dielectric loss, and resistance measurements were carried out to evaluate the changes in the electrical properties; moreover, the mechanical properties of the pristine and irradiated PI were analyzed by the tensile testing system. The irradiation induced chemical bonds and free radicals changes of the PI films were confirmed by the Fourier transform infrared (FTIR) spectra, X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR). The dielectric constant of the PI films decreases with the increase of fluences by the four kinds of irradiation sources.

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Section: Discussionmentioning

confidence: 99%

Low Dielectric Constant Polyimide Obtained by Four Kinds of Irradiation Sources

Yang

Tian

et al. 2020

Polymers

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“…Many researchers have devoted to the investigation on high energy electron and proton irradiation on polymer materials. It is summarized that, the injected high energy particles can induced free radicals inside the materials [8][9][10]16) . Thus, the un-bonded electron in the free radical is considered to enhance the generation of the secondary electron and photoelectron.…”

Section: Discussion and Analysismentioning

confidence: 99%

“…Till now, the measuring development of secondary electron emission yield and photoelectron emission yield of surface materials has lasted for long period by many researchers [3][4][5][6][7] , whereas the high energy particles irradiation tests were also carried out [8][9][10] , especially the LDEF (Long Duration Exposure Facility) satellite which was lunched last centry 11) . However, the literature about electron emission yield of space-simulation degraded polyimide film induced by impinging electron and photon are not available.…”

Section: Introductionmentioning

confidence: 99%

Effects of Energetic Electron and Proton Irradiation on Electron Emission Yield of Polyimide Induced by Electron and Photon

Miyahara

Khan

et al. 2014

AEROSPACE TECHNOLOGY JAPAN

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As the electron emission yield induced by electron and photon plays a key role in surface potential of spacecraft materials, the ground based degradations including 500 keV electron and 50 keV proton irradiation with 4 different fluences were conducted for the polyimide film separately. Based on the developed measuring systems, the comparative measurements of total electron emission yield and photoelectron emission yield were carried out for the virgin and degraded polyimide samples respectively. The total electron emission yield and photoelectron emission yield tended to have different variation tendency after high energy electron and proton irradiation. The Monte-Carlo analysis software Casino and SRIM were used to analysis the distribution and stopping power of electron and proton respectively. According to the measurement results and analysis, the free radicals caused by irradiation was considered to be the main effect for polyimide films, which can primarily reveal the degradation mechanism of energetic electron and proton on the emission yield of polyimide.

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“…The study showed that the compatibility of PA and PP was increased by the irradiation system which provided a new strategy for manufacture and structural properties control of high-performance PA66/PP blend alloy. With the continuous development of high-energy irradiation technology, [21][22][23][24][25][26] its advantages of high efficiency, cleanliness and easy control are widely favored. Electron beam irradiation and other energy irradiations are gradually used in industrial productions.…”

Section: Introductionmentioning

confidence: 99%