Influence of accelerated electrons, solar vacuum ultraviolet, and atomic oxygen on the electrical properties of various types of polymeric materials of spacecraft external surfaces is investigated. It is shown that upon irradiation by 95 keV electrons with fluence of 5 × 1012 cm−2 and solar quanta with a dose of 1500 equivalent sun hours, the volume electrical resistivity does not change or changes by no more than one order of magnitude for some types of the polymeric materials. Irradiation with atomic oxygen with an energy of ~ 5 eV does not lead to a change in bulk resistivity of materials, while the surface resistivity alters depending on the type of polymer. It has been established that isothermal heating in a vacuum of non-irradiated and irradiated with atomic oxygen polymeric materials for a long time leads to the appearance of maxima in the kinetic curves of changes in surface resistivity. A physical model is proposed based on the assumption that at least two processes associated with the evaporation and diffusion of sorbed water molecules or hydroxyl groups into the near-surface layers of polymers are involved in the formation of such maxima.
Space Radiation Effects on Surface and Bulk Resistivity of Polymeric Materials
J Astronaut Sci
2023-09-26
Article (Journal)
Electronic Resource
English
Space radiation resistant transparent polymeric materials
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