A quantitative study in synergistic effects of atomic oxygen and ultraviolet regarding polymer erosion in LEO space environment

Computer Science

Scientific paper

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Space Environment, Materials, Synergistics Effects

Scientific paper

Effect of relative intensity of atomic oxygen and vacuum ultraviolet in the synergistic effect of polyimide erosion was investigated. The relative intensity of atomic oxygen and ultraviolet was adjusted by rotating the polyimide sample at the crossover point of the beam axes of atomic oxygen and ultraviolet which crossed 90 degrees. The erosion rate of polyimide was measured by a quartz crystal microbalance. It was confirmed that the ultraviolet exposure at the atomic oxygen-exposed polyimide promoted the desorption of carbon oxides from the surface. In contrast, no mass change was detected when ultraviolet irradiated the polyimide surface without simultaneous atomic oxygen exposure. By changing the relative intensity of atomic oxygen and ultraviolet, increase in erosion rate up to 400% was observed when relative ultraviolet intensity is high.

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