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Improved adhesion between SnO2/SiO2 coating and polyimide film and its applications to atomic oxygen protection

Alkali solution combined with silica coupling agent were used to modify the surface of polyimide in order to improve adhesion between inorganic coating and polyimide substrate. After surface treatment by NaOH and ?-aminopropyltriethoxysilane (APTES), the water contact angle of polyimide substrate reduced greatly and the SnO2/SiO2 coating was easily formed on it via sol-gel method. The optical transmittance of SnO2/SiO2 coated samples remained steady when the number of coating layers increased from 3 layers to 7 layers. The atomic oxygen (AO) resistance of SnO2/SiO2 coating was done in a ground-based AO simulation system for durability evaluation. Before and after AO irradiation, the morphology changes of the surface was analysed by means of scanning electronic microscope (SEM). The results indicated that the coating prepared by this method shows a very high quality protection to AO erosion.

» Author: Kai Liu, Huifeng Mu, Ming Shu, Zhonghua Li, Yuan Gao

» Reference: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 529

» Publication Date: 20/09/2017

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