层层自组装构建抗原子氧侵蚀纳米复合膜
首发时间:2012-11-29
摘要:通过聚阳离子电解质聚氨基苯乙烯与片层蒙脱土的层层自组装构建抗原子氧剥蚀材料。航天飞行器运行的低地球轨道中富含高活性、高氧化性的原子氧,能够与空间材料发生氧化还原反应,造成表面材料的剥蚀及材料性能退化,进而影响飞行器的使用寿命。为了防止原子氧剥蚀,在航天器外部采用耐原子氧的材料。由于蒙脱土化学性质稳定,与聚电解质在纤维表面形成复合物,能够大大提高纤维的整体抗原子氧性能。地面原子氧模拟系统测试发现,未保护的纤维在原子氧环境下质量损失接近100%,而经过防护的纤维在原子氧环境下损失很少。
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Layer-by-Layer Assembled Nanocomposites Shielding Atomic Oxygen Erosion
Abstract:In this paper, we fabricated layer-by-layer (LbL) assembled montmorillonite (MMT) and poly(p-aminostyrene) (PPAS) nanocomposites on cotton fibers curved surface to provide protection from atomic oxygen (AO) erosion. The multilayers coated fibers had high flexibility, uniformity, defect free, ease of preparation, and low cost. The AO erosion durability has been dramatically enhanced when tested in the ground-based AO effects simulation facility. And the dimension and surface morphologies by SEM had few changes, indicating excellent AO erosion resistant ability of the coatings. These results provide us new method to design fibrous materials exposed directly in LEO environment.
Keywords: Layer by layer assembly atomic oxygen aerospace material
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