Effect of Hydrophilic and Hydrophobic SiO2 Particles on Performances of PI/Al2O3 Composite Films

Yuan Yuan Li; Li Zhu Liu; Hui Shi; Ling Weng; Wie Wei Cui

doi:10.4028/www.scientific.net/KEM.645-646.26

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 645-646Effect of Hydrophilic and Hydrophobic SiO2...

Effect of Hydrophilic and Hydrophobic SiO₂ Particles on Performances of PI/Al₂O₃ Composite Films

Abstract:

In this paper, we mainly analyzed the different influence of hydrophilic SiO₂ particles and hydrophobic SiO₂ particles on the properties of PI/Al₂O₃ films. PI/Al₂O₃/SiO₂(hydrophilic) films and PI/Al₂O₃/SiO₂(hydrophobic) films with 16 wt% content of Al₂O₃ and 3 wt‰, 5 wt‰, 7 wt‰ content of SiO₂ respectively were prepared by in-situ polymerization method. Firstly, the hydrophilic SiO₂ particles and hydrophobic SiO₂ particles were investigated by transmission electron microscopy (TEM), infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The results showed that the average sizes and infrared characteristic peaks of two kinds of SiO₂ particles were similar, and two kinds of SiO₂ particles were amorphous inorganic particles. Then the morphology of the composite films was characterized by scanning electron microscopy (SEM), and the mechanical properties, the breakdown field strength and corona resistant time were tested and analyzed. Results indicated that inorganic particles added to PI/Al₂O₃/SiO₂(hydrophilic) films dispersed better than that of PI/Al₂O₃/SiO₂(hydrophobic) films. When the content of SiO₂ particles was 5 wt‰, the mechanical properties and corona resistance of PI/Al₂O₃/SiO₂(hydrophilic) films were best, the tensile strength, elongation at break and corona resistance times of the films were: 132.44 MPa, 12.64%, 378 min, respectively. The breakdown field strength of PI/Al₂O₃/SiO₂(hydrophilic) films was only 211.15 kV/mm, and inferior to that of PI/Al₂O₃/SiO₂(hydrophobic) films (232.08 kV/mm).

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Periodical:

Key Engineering Materials (Volumes 645-646)

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26-31

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https://doi.org/10.4028/www.scientific.net/KEM.645-646.26

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Online since:

May 2015

Authors:

Yuan Yuan Li, Li Zhu Liu*, Hui Shi, Ling Weng, Wie Wei Cui

Keywords:

Al₂O₃, Hydrophilic, Hydrophobic, PI, SiO₂

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