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- W2585855548 abstract "Abstract Polyimide (PI)/silicon dioxide (SiO 2 ) films have been fabricated by in-situ polymerization method. The average diameter of the SiO 2 nanoparticles is determined to be about 7 nm, which are modified by surface treatment to create surface charges (e-SiO 2 ). Their microstructures are investigated using small angle X-ray scattering (SAXS) technique, Raman Spectroscopy and Scanning Electron Microscopy (SEM). The morphology of the composite films shows better and more uniform dispersion of the e-SiO 2 nanoparticles in PI matrix than SiO 2 nanoparticles due to the coulomb repulsion among surface charged nanoparticles. Our study shows that the resulted uniform dispersion of e-SiO 2 in PI has direct impact on the dielectric constant, dielectric loss, corona aging time and thermal stability of PI/e-SiO 2 composite films and our studied result is presented. The corona aging time of a PI/e-SiO 2 composite film with 20 wt% doping is increased to 128 h, which is forty times more than that of a pure PI film (3 h). In addition, the thermal stability and tensile strength of composite films are also enhanced." @default.
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- W2585855548 date "2017-06-01" @default.
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- W2585855548 title "Effect of surface charged SiO 2 nanoparticles on the microstructure and properties of polyimide/SiO 2 nanocomposite films" @default.
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- W2585855548 doi "https://doi.org/10.1016/j.surfcoat.2017.01.120" @default.
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