Premium
Effect of proton irradiation on structure and optical property of PTFE film
Author(s) -
Peng Guirong,
Yang Dezhuang,
He Shiyu
Publication year - 2003
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.412
Subject(s) - irradiation , materials science , fluence , proton , absorbance , polytetrafluoroethylene , fluorine , photochemistry , optics , composite material , nuclear physics , chemistry , physics , metallurgy
Effects of protons on chemical structure and optical properties of polytetrafluoroethylene (PTFE) film were investigated in the energy range of 60 to 170 keV to simulate the effects of space proton irradiation environment. The results show that for PTFE film irradiated with protons, the change in C 1 s spectrum, along with those in F 1 s and the FT‐IR spectrum after irradiation, demonstrates that two processes take place simultaneously. One is substitution in which carbon to fluorine bonds can be broken by the protons and some positions of fluorine are occupied by active protons; the other is the carbonification, which results in the change of surface color and an increase of carbon percentage on the irradiated surface. For the PTFE film irradiated with 150 keV protons, the spectral absorbance Δ A λ in the wavelengths longer than 300 nm increase unmonotonously with proton fluence, and an abnormally recovery decrease of the Δ A λ with the increase of fluence in the range of 5×10 13 cm −2 to 10 15 cm −2 is observed. The change of the Δ A λ could be related to the competition of the carbonification and the substituting effect. The carbonification increases the Δ A λ , while the substituting increases the amorphousness amount, leading to an increase in the transparency of the film. In addition, the creation of radicals can also contribute to the increase in absorbance. Copyright © 2003 John Wiley & Sons, Ltd.