Abstract: A coating of atomic oxygen resistant was obtained through the sol-gel method, and the precursors for
the coating were synthesized and analyzed. The precursor liquid was prepared by using methacryloxypropyltrimethoxysilane (MAPTMS) and
tetraethylorthosilicate (TEOS). IR spectra of different precursor liquids were compared, and the strength of Si-O bonds was discussed. The coatings
prepared from the precursor liquid were exposed on atomic oxygen in an amount of 5.4×10²⁰/cm². The results obtained demonstrate that
the amount of TEOS addition has greater effects on the strength. SEM experiment shows that they also possess the good performance on the atomic
AO exposed oxygen resistant. The SEM photos show nearly no change for the coatings prepared from the precursors with and without AO exposure,
but the substrate Kapton without protective coating eroded. The coating prepared from this kind of precursor can protect the polymer surface from atomic oxygen erosion, and can be used in the
spacecraft in LEO.

Key words: atomic oxygen, coating, low earth orbital, sol-gel, organic-inorganic hybrids