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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线辐射暴露的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：真空紫外线（VUV）太阳在空间环境中产生的辐射会导致劣化的热量涂层，产生光学，机械和化学性质的变化。这些效果对于聚合物尤为重要。本研究的目的是研究Vuv辐射对基于聚丙烷酰亚胺的聚合物复合材料的影响。使用无定形和结晶SiO 2作为填料。根据引入的填料的多态性结构提出了复合材料的物理机械性能的比较表征。根据具有无定形和结晶SiO 2的复合材料表面的显微硬度，建立了60-65wt％的最佳填料含量。 VUV辐射对具有SiO 2的聚合物复合材料的暴露导致其近表面层的质量损失和变化，这导致光学性质的劣化。在升高的温度（125℃）下，所有具有无定形结晶SiO 2的复合材料的质量损失不超过1.33％，并且用晶体SiO 2，最大质量损失为0.52％。所有组合物的结晶SiO 2的复合材料的质量损失不超过空间产物的允许值为1％。对于具有无定形SiO 2的高填充（50wt％填料或更多）复合材料，VUV处理后的质量损失大于1％，其不允许将它们用于外部空间。研究了VuV处理后热钻涂层的主要光学特性的变化。建立了VUV处理后复合材料表面的平滑。

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