Chen Yufei1,2, Guo Hongyuan2, Chu Hongyue2, Wang Botao2
1. Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education Harbin University of Science and Technology Harbin 150080 China;
2. School of Materials Science and Engineering Harbin University of Science and Technology Harbin 150040 China
The organic montmorillonite(OMMT) was obtained by using octadearyl dimethyl ammonium chloride(OTAC) modified sodium montmorillonite(Na-MMT). The allyl compound and bismaleimide(BMI) as the substrate, 2wt% of polyethersulfone(PES) and different contents(2-8wt%) of OMMT were added into matrix to prepared OMMT/PES/BMI multiphase composites. The changes of infrared characteristic and microstructure of Na-MMT were analyzed by Fourier transform infrared spectroscopy(FT-IR) and scanning electron microscopy(SEM). The results showed that the modification effect was obvious, and the sodium ion was replaced by OTAC organic cation, moreover lamellar structure of OMMT was clear. Dielectric properties test showed that the dielectric constant and dielectric loss tangent of the material display the trend of increased first and then decreased with the increase of mass fraction of OMMT, which reached the minimum of 3.49 and 0.0026 at 100Hz, respectively. The volume resistivity and breakdown strength at this point were also reached the maximum, which was 19.98×1015 Ω·m and 26.07kV/mm, respectively, that increased by 102.4% and 38% compared to samples without OMMT.
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2018, Vol. 33 
