Abstract
Polyimide is type of heterocyclic polymer compound characterized by an imide ring structure. The aromatic ring structure in polyimide facilitates good electrical properties, mechanical properties, thermal properties and radiation resistance, etc. It is widely used in the aerospace field, in electronic components and in the semiconductor industry. Traditional methods for the preparation of polyimide films have different limitations. Here, a new one-step method was established to prepare polyimide coatings using liquid flame spray. The effect of different mass fraction on the surface and cross section structure characteristics of polyimide coatings was studied. The formation process of the polyimide-alumina composite coatings was analyzed using single particles and coatings with different amount of alumina. The composite coating shows a flat and dense structure and excellent dielectric properties. The results shed light on construction of polymer-inorganic composite layers for widespread applications.
Highlights
Polyimide material has good comprehensive performance and is currently the best temperature-resistant polymer material in industrial applications
A large amount of research is currently focused on inorganic particles such as carbon nanotubes, graphene, boron nitride, WO3, Al2 O3, SiO2, etc. [4,5,6,7,8,9,10,11]
The polyimide precursor solution polyamic acid (PAA) prepared here has a mass fraction of 10%
Summary
Polyimide material has good comprehensive performance and is currently the best temperature-resistant polymer material in industrial applications. Polyimide has excellent electrical and mechanical properties and is widely used as an electrical insulation material [1,2]. The elastic modulus of polyimide fiber can reach 200 GPa, showing a low coefficient of thermal expansion and a high radiation resistance [3]. Through the modification of inorganic particles and the development of inorganic particles with special functions, polyimide/inorganic hybrid composite coatings were studied to improve the structure and performance of polyimide. Recent studies focused on the preparation of polyimide microspheres [12], which have a larger specific surface area, better dispersibility in solvents, and improved processing performance and temperature resistance, giving polyimide materials a wider range of applications
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