POSS改性耐紫外耐高温型涂层材料的研究
发布时间：2019-05-22 07:11
【摘要】：近地球轨道空间是一个复杂的动态环境中,其中紫外线辐射对近空间飞行器表面材料具有很强的腐蚀作用,大幅度缩短了航天器的使用寿命。因此,研究制备出耐紫外辐射的防护材料具有重要的理论和现实意义。近年来,POSS作为一种新型的有机／无机纳米复合材料,可以改性多种聚合物以得到独特的热稳定性、耐紫外性和机械性能等。本文自行制备了八(氨苯基)笼型倍半硅氧烷(OAPS)。随后我们分别利用聚醚型、聚二甲基硅氧烷型和星型聚(脲-酰亚胺)(PUI)作为基体树脂,OAPS作为无机前驱体,采用原位聚合的方法制备出一系列紫外防护耐高温涂层材料。我们将材料暴露在紫外辐射光源下48小时进行紫外辐射实验,然后对其进行TGA,XPS,SEM,质量损失测试,拉伸测试等测试和表征,通过改变OAPS的含量,研究不同含量笼型倍半硅氧烷POSS和PUI结构对材料耐热性能、力学性能和耐紫外性能的影响。结果表明,POSS改性的星型聚(脲-酰亚胺)表现出优良的耐热分解性,初始热分解温度最高达到340℃。耐紫外性能最好的是POSS改性聚二甲基硅氧烷型聚(脲-酰亚胺)。POSS的加入使材料受到紫外线照射时,表面迅速形成Si02陶瓷钝化层,钝化层能够防止底层聚合物进一步被腐蚀,从而有效提高复合材料的耐紫外性能。
[Abstract]:Near-Earth orbit space is a complex dynamic environment, in which ultraviolet radiation has a strong corrosion effect on the surface materials of near-space vehicles, which greatly shortens the service life of spacecraft. Therefore, it is of great theoretical and practical significance to study and prepare protective materials against ultraviolet radiation. In recent years, POSS, as a new type of organic / inorganic nanocomposites, can modify a variety of polymers to obtain unique thermal stability, UV resistance and mechanical properties. Eight (aminophenyl) cage silsesquioxane (OAPS). Was prepared by ourselves. Then, a series of UV protective high temperature resistant coatings were prepared by in situ polymerization using polyether type, polydimethyl siloxane type and star type polyurea imide) (PUI) as matrix resin and OAPS as inorganic precursor, respectively. a series of UV protective high temperature resistant coatings were prepared by in situ polymerization. We exposed the material to ultraviolet radiation source for 48 hours, then tested and characterized the mass loss of TGA,XPS,SEM, tensile test and so on. By changing the content of OAPS, The effects of different content of cage silsesquioxane POSS and PUI on the heat resistance, mechanical properties and UV resistance of the materials were studied. The results show that the star Poly (urea-imide) modified by POSS shows excellent heat-resistant decomposition, and the initial thermal decomposition temperature is up to 340 鈩，
本文编号：2482770
[Abstract]:Near-Earth orbit space is a complex dynamic environment, in which ultraviolet radiation has a strong corrosion effect on the surface materials of near-space vehicles, which greatly shortens the service life of spacecraft. Therefore, it is of great theoretical and practical significance to study and prepare protective materials against ultraviolet radiation. In recent years, POSS, as a new type of organic / inorganic nanocomposites, can modify a variety of polymers to obtain unique thermal stability, UV resistance and mechanical properties. Eight (aminophenyl) cage silsesquioxane (OAPS). Was prepared by ourselves. Then, a series of UV protective high temperature resistant coatings were prepared by in situ polymerization using polyether type, polydimethyl siloxane type and star type polyurea imide) (PUI) as matrix resin and OAPS as inorganic precursor, respectively. a series of UV protective high temperature resistant coatings were prepared by in situ polymerization. We exposed the material to ultraviolet radiation source for 48 hours, then tested and characterized the mass loss of TGA,XPS,SEM, tensile test and so on. By changing the content of OAPS, The effects of different content of cage silsesquioxane POSS and PUI on the heat resistance, mechanical properties and UV resistance of the materials were studied. The results show that the star Poly (urea-imide) modified by POSS shows excellent heat-resistant decomposition, and the initial thermal decomposition temperature is up to 340 鈩，
本文编号：2482770
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