Translational Energy Dependence of the O + Polyimide Reaction.
AEROSPACE CORP EL SEGUNDO CA CHEMISTRY AND PHYSICS LAB
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This work attempted to answer more clearly the question of whether the rate of reaction of atomic oxygen with polyimide films depends, for energies up to 5 eV, on the translational energy of the atom. Atomic beam experiments are reported in which atomic oxygen, produced in a conventional microwave discharge beams source, struck Kapton samples ar a translational energy of approximately 0.14 eV. After being exposed to an atomic oxygen fluence in excess of 2 x 10 to the 19th powersq cm, the Kapton samples showed no evidence of reaction, either to the naked eye or under microscopic examination. These experiments, and others performed in this laboratory and elsewhere, strongly support the notion that there is a true dynamic barrier in incident translation of between 0.2 and 1 eV for the etching of polyimide films by atomic oxygen. Keywords Low earth orbit effects Polyimide oxidation of polymers.
- Physical Chemistry
- Coatings, Colorants and Finishes