本文選題：Kapton基材 + 原子氧��； 參考：《煙臺(tái)大學(xué)》2017年碩士論文

【摘要】：在低地球軌道(LEO)環(huán)境中,原子氧(AO)是最主要的成分。它的化學(xué)性質(zhì)十分活潑,與Kapton基材發(fā)生相互作用時(shí),可能會(huì)導(dǎo)致基材表面受到侵蝕,造成化學(xué)成分、表面形態(tài)、光學(xué)性能發(fā)生改變甚至導(dǎo)致航天器表面形成顆粒和分子污染。為了解決這個(gè)問(wèn)題,通常會(huì)在基材表面涂覆無(wú)機(jī)防護(hù)AO薄膜。然而,在疏水性的Kapton基材上制備親水性的涂層是十分困難的,因此有必要對(duì)Kapton基材表面進(jìn)行改性處理用來(lái)改善基材的潤(rùn)濕性。在本文中,我們使用堿水熱處理和硅烷偶聯(lián)劑等表面改性方法改變Kapton基材的表面性質(zhì)。采用溶膠-凝膠法在Kapton表面制備無(wú)機(jī)防護(hù)涂層,研究無(wú)機(jī)涂層在運(yùn)輸和儲(chǔ)存過(guò)程中產(chǎn)生的開(kāi)裂情況。并且對(duì)SiO_2/Ti O_2涂層的防護(hù)原子氧能力進(jìn)行了研究。研究成果如下:(1)水熱法對(duì)Kapton基材進(jìn)行表面改性處理:研究了水熱處理三種不同厚度的Kapton基材的外觀形貌、接觸角和透光率的變化情況。實(shí)驗(yàn)結(jié)果顯示:經(jīng)水熱處理后Kapton基材表面親水性增加,不同的Kapton基材的水熱條件不同。(2)溶劑熱法和Sol-gel法制備SiO_2涂層:研究了硅烷偶聯(lián)劑在溶劑熱過(guò)程中對(duì)Kapton基材的表面改性效果。用sol-gel法在Kapton表面制備無(wú)機(jī)SiO_2涂層。研究了Kapton樣品的表面形態(tài)、濕潤(rùn)性和透光率的變化。實(shí)驗(yàn)結(jié)果證明:溶劑熱過(guò)程能有效提高SiO_2涂層與Kapton基體間的界面粘附力,制備的薄膜表面均勻,沒(méi)有裂痕。(3)SiO_2涂層環(huán)境效應(yīng)評(píng)價(jià):利用堿水熱處理和γ-氨基丙基三乙氧基硅烷(KH550)結(jié)合處理的方法對(duì)Kapton進(jìn)行表面改性。用sol-gel法在Kapton表面制備無(wú)機(jī)SiO_2涂層。模擬不同條件下自然紫外老化實(shí)驗(yàn)的老化效果,討論了紫外線(UV)輻射,輻射時(shí)間和環(huán)境濕度對(duì)SiO_2涂層性能的影響。結(jié)果表明:環(huán)境濕度對(duì)SiO_2涂層與基體界面粘附力有著不可忽視的影響。(4)氨水改性和sol-gel法制備SiO_2/Ti O_2涂層:為了提高聚合物的表面濕潤(rùn)性,用氨水改性和硅烷偶聯(lián)劑溶劑熱處理改性Kapton基材。為了抵抗AO侵蝕,用sol-gel在Kapton表面制備SiO_2/Ti O_2涂層。通過(guò)紫外-可見(jiàn)光譜和掃描電子顯微鏡(SEM)研究樣品的光學(xué)透射率和表面形態(tài)。結(jié)果表明:在Kapton表面上涂覆著均一、致密的SiO_2/Ti O_2復(fù)合涂層。在原子氧曝光后,涂層變得更加緊湊,沒(méi)有出現(xiàn)脫落的現(xiàn)象。涂覆SiO_2/Ti O_2涂層的Kapton樣品的原子氧侵蝕產(chǎn)出值急劇下降,并且樣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 緯 -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.
【學(xué)位授予單位】：煙臺(tái)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ317;TB306

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