Computer Science
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.540..153b&link_type=abstract
In: Proceedings of the 9th International Symposium on Materials in a Space Environment, 16-20 June 2003, Noordwijk, The Netherla
Computer Science
Space Environment, Materials
Scientific paper
Hybrid inorganic/organic polymers have been prepared by copolymerizing a polyimide having the same chemical repeat unit as Kapton with polyhedral oligomeric silsesquioxanes (POSS). These POSS/polyimide hybrid polymers are essentially Kapton-like polymers containing POSS nanoparticles that are chemically bound to the polymer chain. Samples of these POSS polyimides, as well as polyimide controls, have been exposed to a hyperthermal O-atom beam that is produced by a laserdetonation source. Exposed and unexposed surfaces have been characterized with the use of x-ray photoelectron spectroscopy, atomic force microscopy, and surface profilometry. The data indicate that the POSS-containing polyimides have significantly lower erosion yields than Kapton, most likely because they form a surface SiO2 layer which passivates the surface and protects the polymer from further O-atom attack. These results suggest promise for the use of POSS polyimide polymers as "drop-in" replacements for Kapton on spacecraft operating in the low-Earth orbital environment.
Brunsvold Amy L.
Gonzalez Rene I.
Gouzman Irina
Grossman Eitan
Minton Timothy K.
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