纳米颗粒增强环氧树脂抗原子氧剥蚀性能机理研究

 为了提高航天器用树脂基材料的抗原子氧剥蚀性能，将不与原子氧反应的无机纳米二氧化硅颗粒添加到环氧树脂中，并对所制成的纳米复合材料试样进行原子氧效应地面模拟试验，分析了试验前后试样表面形貌、表面成分和表面化学结构的变化规律。结果表明，加入纳米颗粒后，环氧试样的质量损失和剥蚀率出现了明显的下降，抗原子氧剥蚀性能得到了大幅度的提高。同时，试验后的纳米复合材料表面仍然存在一些新的有机结构，它们和纳米二氧化硅颗粒一起，共同阻止原子氧对底层材料的进一步剥蚀。

Investigation of Atomic Oxygen Resistance Improving Mechanism for Epoxy/Silica Nanocomposites

To improve the atomic oxygen (AO) resistance of the sp acecraft resin matrix material, the inorganic silica nanoparticles are filled in to the epoxy resin.Samples of the epoxy/silica nanocomposites are prepared and t he AO exposure experiments are conducted in a ground-based AO effect simulation facility.The samples exhibites significantly less mass loss and erosion yield t han the corresponding pristine epoxy resin.After AO exposure for 60 h, the erosi on yield of the nanocomposite containing 15 phr nanoparticles decreases to 9.4% of that of the pristine epoxy resin.Analyses of the surface morphology, surface compositions and surface chemical structures show that after the AO exposure ex periment some organic structures still resides on the nanocomposites surfaces be sides the nanoparticles.The organic structures are nonreactive with AO.The silic a nanoparticles and the organic structures can serve as a barrier to resist furt her erosion.