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首页> 外文期刊>Acta astronautica >Effect of SiO_2 crystal structure on the stability of polymer composites exposed to vacuum ultraviolet radiation
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Effect of SiO_2 crystal structure on the stability of polymer composites exposed to vacuum ultraviolet radiation

机译：SiO_2晶体结构对真空紫外辐射下聚合物复合材料稳定性的影响

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Vacuum ultraviolet (VUV) radiation produced by the Sun in the space environment can cause degradation to thermoregulating coatings producing changes in optical, mechanical, and chemical properties. These effects are particularly important for polymers. The purpose of this study was to study the effect of VUV radiation on polymeric composites based on polyalkaneimide. Amorphous and crystalline SiO2 were used as the filler. A comparative characterization of physico-mechanical properties of composites is presented depending on the polymorphic structure of the filler being introduced. According to the microhardness of the surface of composites with amorphous and crystalline SiO2, an optimum filler content of 60-65 wt% is established. The exposure of VUV radiation to polymeric composites with SiO2 leads to a mass loss and a change in their near-surface layers, which leads to a deterioration in the optical properties. At an elevated temperature (125 degrees C), the mass loss of all composites with amorphous crystalline SiO2 does not exceed 1.33%, and with crystalline SiO2, the maximum mass loss is 0.52%. The mass loss of composites with crystalline SiO2 of all compositions did not exceed the allowable value for spacecraft products of 1%. For high-filled (50 wt% filler or more) composites with amorphous SiO2, mass loss after VUV treatment is more than 1%, which does not allow them to be used in outer space. The change in the main optical characteristics of thermoregulating coatings after VUV treatment was studied. The smoothing of the surface of composites after VUV treatment is established.
机译：太阳在太空环境中产生的真空紫外线（VUV）辐射会导致温度调节涂层退化，从而导致光学，机械和化学性质发生变化。这些效果对于聚合物特别重要。这项研究的目的是研究VUV辐射对基于聚烷酰亚胺的聚合物复合材料的影响。非晶态和结晶态的SiO2被用作填料。根据所引入的填料的多晶型结构，对复合材料的物理机械性能进行了比较表征。根据具有非晶态和结晶态SiO2的复合材料表面的显微硬度，可以确定60-65 wt％的最佳填料含量。 VUV辐射暴露于含SiO2的聚合物复合材料会导致质量损失和其近表面层的变化，从而导致光学性能下降。在升高的温度（125摄氏度）下，所有具有无定形晶体SiO2的复合材料的质量损失均不超过1.33％，而具有晶体SiO2的复合材料的最大质量损失为0.52％。具有所有成分的晶体SiO2的复合材料的质量损失均不超过航天器产品的允许值1％。对于具有无定形SiO2的高填充（填料含量为50 wt％或更高）的复合材料，VUV处理后的质量损失超过1％，这不允许它们在外部空间中使用。研究了VUV处理后调温涂料主要光学特性的变化。建立了VUV处理后复合材料表面的光滑度。

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