在聚酰亚胺表面构筑含微纳米SiO_(2)颗粒涂层的方法研究  

Study on Preparation of a Coating Composed of Micro-Nano SiO_(2) Particles on Polyimide Surface

作　　者：徐灿 邱心宇 郭云[2] 刘惠涛[1] 高原[1] XU Can;QIU Xin-yu;GUO Yun;LIU Hui-tao;GAO Yuan(College of Chemistry and Chemical Engineering,Yantai University,Yantai 264005,China;National Key Lab.of Science and Technology on Vacuum Technology&Physics,Lanzhou Institute of Physics,Lanzhou 730000,China)

机构地区：[1]烟台大学化学化工学院,山东烟台264005 [2]兰州空间技术物理研究所真空技术与物理国防科技重点实验室,兰州730000

出　　处：《表面技术》2021年第6期169-176,共8页Surface Technology

基　　金：国家自然科学基金(51573155)。

摘　　要：目的研究一种将Stober法制备的SiO_(2)纳米微球分散在含硅溶胶体系中,在聚酰亚胺(PI,Kapton)表面制备含SiO_(2)微纳米颗粒涂层的新方法,并利用该涂层提高Kapton薄膜的使用寿命和抗原子氧(atomic oxygen,AO)侵蚀能力。方法用正硅酸乙酯(TEOS)在碱性条件下制备Stober微球,用3-氨丙基三乙氧基硅烷(APTES)在酸性条件下制备含硅溶胶。将Stober微球均匀分散到溶胶中,用提拉镀膜方法在经低浓度NaOH水热处理后的Kapton薄膜表面,制备含SiO_(2)微纳米颗粒的涂层。在束流密度为1.43×10~(16) atoms/(cm^(2)·s),辐照时间为6 h的AO环境中进行模拟试验。用SEM扫描电镜和AFM原子力显微镜表征试验前后样品的表面形貌。结果 AO辐照后,原始Kapton薄膜的质量损失和AO侵蚀率分别为1.39 mg/cm^(2)和3.17×10^(-24) cm^(3)/atom,且Kapton表面被严重侵蚀;而有涂层的Kapton样品,质量损失和AO侵蚀率分别下降为0.10 mg/cm^(2)和0.22×10^(-24) cm^(3)/atom,侵蚀率只相当于原始Kapton的6.9%。结论采用Stober与sol-gel相结合的方法,提高了所制备涂层中SiO_(2)的含量。模拟试验表明,该涂层提高了样品的抗AO侵蚀能力。此制备方法简单实用,对于长寿命航天器中聚合物材料的AO防护,具有一定的研究意义。A new method for preparing a coating composed of micro-nano SiO_(2) particles on polyimide surface by dispersive SiO_(2) nanospheres in silica sol using Stöber and sol-gel methods was studied.The coating is used to increase the service life and erosion resistance of Kapton films to atomic oxygen(AO).Firstly,Stöber nanospheres were prepared with TEOS under alkaline conditions;then,silica sol was prepared under acidic conditions with 3-aminopropyltriethoxysilane(APTES).The nanospheres were uniformly dispersed into the sol,and the coating with SiO_(2) particles was prepared on the Kapton surface by dip coating method.Before coating,Kapton films were hydrothermally treated with low concentration NaOH.The simulation experiment was conducted in an AO environment with a beam density of 1.43×1016 atoms/(cm^(2)·s)and an irradiation time of 6 h.The surface morphology of samples before and after experiment was characterized by scanning electron microscope(SEM)and atomic force microscope(AFM).After AO irradiation,the mass loss and AO erosion rate of pristine Kapton were 1.39 mg/cm^(2) and 3.17×10^(-24) cm^(3)/atom,respectively,and the Kapton surface was severely eroded.For coated Kapton samples,mass loss and AO erosion rate decreased to 0.10 mg/cm^(2) and 0.22×10^(-24) cm^(3)/atom,respectively,which was only equivalent to 6.9%of pristine Kapton.Using the method of combining Stöber and sol-gel,the SiO_(2) content was increased in the prepared coating.Simulation experiments show that the coating improves the AO erosion resistance of Kapton.This method is simple and practical,and has certain research significance for AO protection of polymer materials in long-life spacecraft.

关 键 词：聚酰亚胺 SiO_(2) 涂层 St?ber法 SOL-GEL KAPTON 表面改性 

分 类 号：TG174.4[金属学及工艺—金属表面处理] V261.933[金属学及工艺—金属学]