Vespel SP-1 material degradation in space applications

Good afternoon,

I'm trying to search only based on bibliography or numerical and theoretical calculations the change of the thermal optical properties, namely the solar absorptivity, of a polyimide-based plastics (VESPEL SP-1) in space conditions (considering radiation, atomized oxygen atoms., etc)

My question is how could I estimate the variation on the thermal optical properties of this materials without doing any experimental test (ageing tests). Also in bibliography I didn't found any model or any empirical correlation...

Thank you in advance,
Ricardo Gomes
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