Synergistic effects of atomic oxygen and thermal cycling in low earth orbit on polymer-matrixed space material.

Polymer-matrixed materials are widely used in the spacecrafts' structures. However, crafts located in the LEO（Low Earth Orbit） would suffer from hazardous environment factors when orbiting in the space. It has been reported that the space environment factors' integral effect (which represents the factual detriment in space) is not equivalent to the simple summation of each individual. Hence, atomic oxygen and thermal cycling were selected as the starting point for studying the typical LEO synergistic effects on polymer-matrixed space material. In this work, methods such as surface morphology observation, surface components analyzation and inter-laminar-shear strength test were embraced to gather the basic information for the study of degradation. As a result, focusing on the composites selected in this work, synergistic effects do exist between the two factors (AO&TC, representing for atomic oxygen and thermal cycling combined). Besides, a quantified index was proposed to represent synergistic characteristics，so as to lay the foundation for the scientific evolution of material characterization.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper