Erosion of polyimide modified by amorphous silica sol in the stream of oxygen plasma |
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| Authors: | K B Vernigorov A Yu Alent’ev A M Muzafarov L S Novikov V N Chernik |
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| Institution: | 1.Faculty of Chemistry,Moscow State University,Moscow,Russia;2.Topchiev Institute of Petrochemical Synthesis,Russian Academy of Sciences,Moscow,Russia;3.Enikolopov Institute of Synthetic Polymeric Materials,Russian Academy of Sciences,Moscow,Russia;4.Skobeltsyn Institute of Nuclear Physics,Moscow State University,Moscow,Russia |
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| Abstract: | Polymeric coatings derived from Kapton H polyimide, thermoplastic polyimide (PI), and a composite with amorphous silica sol
(PI-SS) were irradiated in a magnetoplasma dynamic accelerator of oxygen plasma simulating the action of atomic oxygen (AO).
The volumetric erosion coefficients of polymers were calculated, and the comparative analysis of the stability of coatings
was performed. The changes in morphology of polymer surfaces before and after irradiation were studied by means of scanning
electron microscopy. It was shown that the PI-SS composite has increased resistance to atomic oxygen. The composition of the
PI-SS composite was found at which the particles of silica sol are uniformly dispersed over the polymer volume that explains
a better resistance of PI-SS polymeric-inorganic compositions to the action of atomic oxygen. The lowest stability was registered
for the coating based on Kapton H polyimide. The surfaces of all coatings after irradiation were found to possess a carpetlike
morphology. Each polymer featured a number of distinctive peculiarities of the surface structure caused by the differences
in the chemical structure of the polymides under investigation. |
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