Dielectric Properties of Polytetrafluoroethylene/CaCu3Ti4O12 Composites
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2019年第1期
论文作者：梁飞 ZHAO Yifei CHEN Xizi WAN Qianxing Lü Wenzhong
文章页码：189 - 194
摘 要：Polymer-based composite was investigated by embedding calcium copper titanate(CaCu3Ti4O12; CCTO) fillers into polytetrafluoroethylene（PTFE） matrix. The dielectric performances of the composite were investigated within the frequency range from 100 Hz to 1 MHz. It is indicated that dielectric permittivity（ε） and dielectric loss（tanδ） increase gradually as the filler content increases. Dielectric permittivity for the composite with 50 vol% CCTO filler loading is 33.5, approximately 16 times higher than that of pure PTFE（ε = 2.1） at 100 Hz. As the frequency increases, the dielectric loss decreases rapidly and reaches stability, and then remains low when the frequency rises to 1 MHz. The values for dielectric permittivity and dielectric loss in the microwave frequency（8-13 GHz） are lower than that in low frequency of 10 kHz for the composites because of different polarization modes. Several theoretical models were implemented to compare the experimental results with the theoretical calculations and the modified Lichtenecker equation was found to fit the best.
梁飞，ZHAO Yifei，CHEN Xizi，WAN Qianxing，Lü Wenzhong
Key Laboratory of Functional Materials for Electronic Information (B), Ministry of Education, Huazhong University of Science and Technology
摘 要：Polymer-based composite was investigated by embedding calcium copper titanate(CaCu3Ti4O12; CCTO) fillers into polytetrafluoroethylene（PTFE） matrix. The dielectric performances of the composite were investigated within the frequency range from 100 Hz to 1 MHz. It is indicated that dielectric permittivity（ε） and dielectric loss（tanδ） increase gradually as the filler content increases. Dielectric permittivity for the composite with 50 vol% CCTO filler loading is 33.5, approximately 16 times higher than that of pure PTFE（ε = 2.1） at 100 Hz. As the frequency increases, the dielectric loss decreases rapidly and reaches stability, and then remains low when the frequency rises to 1 MHz. The values for dielectric permittivity and dielectric loss in the microwave frequency（8-13 GHz） are lower than that in low frequency of 10 kHz for the composites because of different polarization modes. Several theoretical models were implemented to compare the experimental results with the theoretical calculations and the modified Lichtenecker equation was found to fit the best.
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