Kapton表面改性及原子氧防护涂层制备方法研究

发布时间：2018-06-03 15:33

本文选题：Kapton基材 + 原子氧　；参考：《烟台大学》2017年硕士论文

【摘要】：在低地球轨道(LEO)环境中,原子氧(AO)是最主要的成分。它的化学性质十分活泼,与Kapton基材发生相互作用时,可能会导致基材表面受到侵蚀,造成化学成分、表面形态、光学性能发生改变甚至导致航天器表面形成颗粒和分子污染。为了解决这个问题,通常会在基材表面涂覆无机防护AO薄膜。然而,在疏水性的Kapton基材上制备亲水性的涂层是十分困难的,因此有必要对Kapton基材表面进行改性处理用来改善基材的润湿性。在本文中,我们使用碱水热处理和硅烷偶联剂等表面改性方法改变Kapton基材的表面性质。采用溶胶-凝胶法在Kapton表面制备无机防护涂层,研究无机涂层在运输和储存过程中产生的开裂情况。并且对SiO_2/Ti O_2涂层的防护原子氧能力进行了研究。研究成果如下:(1)水热法对Kapton基材进行表面改性处理:研究了水热处理三种不同厚度的Kapton基材的外观形貌、接触角和透光率的变化情况。实验结果显示:经水热处理后Kapton基材表面亲水性增加,不同的Kapton基材的水热条件不同。(2)溶剂热法和Sol-gel法制备SiO_2涂层:研究了硅烷偶联剂在溶剂热过程中对Kapton基材的表面改性效果。用sol-gel法在Kapton表面制备无机SiO_2涂层。研究了Kapton样品的表面形态、湿润性和透光率的变化。实验结果证明:溶剂热过程能有效提高SiO_2涂层与Kapton基体间的界面粘附力,制备的薄膜表面均匀,没有裂痕。(3)SiO_2涂层环境效应评价:利用碱水热处理和γ-氨基丙基三乙氧基硅烷(KH550)结合处理的方法对Kapton进行表面改性。用sol-gel法在Kapton表面制备无机SiO_2涂层。模拟不同条件下自然紫外老化实验的老化效果,讨论了紫外线(UV)辐射,辐射时间和环境湿度对SiO_2涂层性能的影响。结果表明:环境湿度对SiO_2涂层与基体界面粘附力有着不可忽视的影响。(4)氨水改性和sol-gel法制备SiO_2/Ti O_2涂层:为了提高聚合物的表面湿润性,用氨水改性和硅烷偶联剂溶剂热处理改性Kapton基材。为了抵抗AO侵蚀,用sol-gel在Kapton表面制备SiO_2/Ti O_2涂层。通过紫外-可见光谱和扫描电子显微镜(SEM)研究样品的光学透射率和表面形态。结果表明:在Kapton表面上涂覆着均一、致密的SiO_2/Ti O_2复合涂层。在原子氧曝光后,涂层变得更加紧凑,没有出现脱落的现象。涂覆SiO_2/Ti O_2涂层的Kapton样品的原子氧侵蚀产出值急剧下降,并且样品具有良好的透光率。
[Abstract]:AOO is the most important component in low Earth orbit (Leo) environment. Its chemical properties are very active. When it interacts with Kapton substrate, it may lead to the erosion of the substrate surface, resulting in chemical composition, surface morphology, optical properties change and even lead to the formation of particles and molecular pollution on the surface of spacecraft. To solve this problem, inorganic protective AO films are usually coated on the substrate surface. However, it is very difficult to prepare hydrophilic coatings on hydrophobic Kapton substrates, so it is necessary to modify the surface of Kapton substrates to improve the wettability of the substrates. In this paper, surface modification methods such as alkali hydrothermal treatment and silane coupling agent are used to change the surface properties of Kapton substrate. Inorganic protective coatings were prepared on the surface of Kapton by sol-gel method. The cracking of inorganic coatings during transportation and storage was studied. The protection ability of SiO_2/Ti O 2 coating against atomic oxygen was also studied. The results are as follows: (1) Surface modification of Kapton substrate by hydrothermal method: the changes of appearance, contact angle and transmittance of three kinds of Kapton substrates with different thickness after hydrothermal treatment were studied. The experimental results show that the surface hydrophilicity of Kapton substrate increases after hydrothermal treatment. SiO_2 coatings were prepared by solvothermal method and Sol-gel method with different hydrothermal conditions of Kapton substrates. The effect of silane coupling agent on the surface modification of Kapton substrate during solvothermal process was studied. Inorganic SiO_2 coatings were prepared on Kapton by sol-gel method. The changes of surface morphology, wettability and transmittance of Kapton were studied. The experimental results show that solvothermal process can effectively improve the interfacial adhesion between SiO_2 coating and Kapton substrate, and the film surface is uniform. Environmental effect evaluation of SiO2 coating without crack: surface modification of Kapton was carried out by alkali hydrothermal treatment and 纬 -aminopropyl triethoxy silane KH550. Inorganic SiO_2 coatings were prepared on Kapton by sol-gel method. The effects of UV radiation, radiation time and environmental humidity on the properties of SiO_2 coatings were discussed. The results show that the influence of environmental humidity on the adhesion between SiO_2 coating and substrate is not negligible. 4) modified with ammonia and prepared by sol-gel method, SiO_2/Ti O\ -2 coating is prepared in order to improve the surface wettability of polymer. The Kapton substrate was modified with ammonia and silane coupling agent solvent heat treatment. In order to resist AO erosion, SiO_2/Ti O _ 2 coating was prepared on Kapton surface by sol-gel. The optical transmittance and surface morphology of the samples were studied by UV-Vis spectra and scanning electron microscopy (SEM). The results show that there is a uniform and compact SiO_2/Ti O\ -2 composite coating on the surface of Kapton. After atomic oxygen exposure, the coating becomes more compact and does not fall off. The atomic oxygen erosion yield of Kapton coated with SiO_2/Ti O _ 2 coating decreased sharply, and the sample had a good transmittance.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ317;TB306

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