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Title: Pyrolytic carbon free-radical evolution and irradiation damage of polyimide under low-energy proton irradiation

Abstract

Ionization and displacement effects are basic phenomena in damage processes of materials under space-particle irradiation. In this paper, the damage behaviors were investigated on the polyimide under proton irradiation using electron paramagnetic resonance (EPR) spectra analysis and optical absorbance valuation. The results indicate that the proton irradiation induces the formation of pyrolytic carbon free-radical with a g value of 2.0025, and the population of free radicals increases with the irradiation fluence. The most important finding is that the irradiation-induced free-radical population increases linearly with the displacement damage dose, as does the optical degradation, whereas the ionization effect alone, during the irradiation, cannot induce the formation of pyrolytic carbon free radical. Furthermore, during the post storage, after irradiation, the free-radical population decreases following a sum of an exponential and a linear mode with the storage time. It is interesting that, during the post storage, the recovery of the degraded optical absorbance of the polyimide follows a similar mode to that of free radicals, and the characteristic time constant changes with the wavelength of the optical spectra.

Authors:
; ; ; ; ;  [1]
  1. National Key Lab in Materials Behaviors and Evaluation Technology in Space Environments, Harbin Institute of Technology, Harbin 150001 (China)
Publication Date:
OSTI Identifier:
22038823
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 110; Journal Issue: 12; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; ELECTRON SPIN RESONANCE; G VALUE; INFRARED SPECTRA; IONIZATION; IRRADIATION; ORGANIC POLYMERS; PARAMAGNETISM; PROTONS; PYROLYTIC CARBON; RADIATION EFFECTS; RADICALS; VISIBLE SPECTRA

Citation Formats

Chengyue, Sun, Yiyong, Wu, Jingdong, Xiao, Ruifeng, Li, Dezhuang, Yang, and Shiyu, He. Pyrolytic carbon free-radical evolution and irradiation damage of polyimide under low-energy proton irradiation. United States: N. p., 2011. Web. doi:10.1063/1.3662492.
Chengyue, Sun, Yiyong, Wu, Jingdong, Xiao, Ruifeng, Li, Dezhuang, Yang, & Shiyu, He. Pyrolytic carbon free-radical evolution and irradiation damage of polyimide under low-energy proton irradiation. United States. https://doi.org/10.1063/1.3662492
Chengyue, Sun, Yiyong, Wu, Jingdong, Xiao, Ruifeng, Li, Dezhuang, Yang, and Shiyu, He. 2011. "Pyrolytic carbon free-radical evolution and irradiation damage of polyimide under low-energy proton irradiation". United States. https://doi.org/10.1063/1.3662492.
@article{osti_22038823,
title = {Pyrolytic carbon free-radical evolution and irradiation damage of polyimide under low-energy proton irradiation},
author = {Chengyue, Sun and Yiyong, Wu and Jingdong, Xiao and Ruifeng, Li and Dezhuang, Yang and Shiyu, He},
abstractNote = {Ionization and displacement effects are basic phenomena in damage processes of materials under space-particle irradiation. In this paper, the damage behaviors were investigated on the polyimide under proton irradiation using electron paramagnetic resonance (EPR) spectra analysis and optical absorbance valuation. The results indicate that the proton irradiation induces the formation of pyrolytic carbon free-radical with a g value of 2.0025, and the population of free radicals increases with the irradiation fluence. The most important finding is that the irradiation-induced free-radical population increases linearly with the displacement damage dose, as does the optical degradation, whereas the ionization effect alone, during the irradiation, cannot induce the formation of pyrolytic carbon free radical. Furthermore, during the post storage, after irradiation, the free-radical population decreases following a sum of an exponential and a linear mode with the storage time. It is interesting that, during the post storage, the recovery of the degraded optical absorbance of the polyimide follows a similar mode to that of free radicals, and the characteristic time constant changes with the wavelength of the optical spectra.},
doi = {10.1063/1.3662492},
url = {https://www.osti.gov/biblio/22038823}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 12,
volume = 110,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2011},
month = {Thu Dec 15 00:00:00 EST 2011}
}