Abstract
The following properties of the organic glass SO-120 after its exposure for 102 and 456 days in outer space were measured: weight loss, dimensions, density, transparency, the Charpy impact strength, mechanical properties under dynamic load, transition temperatures, and the coefficient of thermal expansion. The mechanism of the underlying processes has been found to involve scission of carbon-carbon bonds in the polymer backbone, photolysis of the side ester groups, and loosening of the intercluster regions, all localized in a surface layer of maximum thickness of 111 μm. Shielding of the SO-120 glass by a protective PTFE film prevents the damage of the surface layer.
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