氧化石墨/钛酸钡/环氧树脂三相复合材料的制备及其介电性能研究

Preparation and Dielectric Properties of the Three-phase Composites of Graphite Oxide/Barium Titanate/Epoxy Resin

利用浓硫酸、高锰酸钾等强氧化剂制备了氧化石墨,将其与钛酸钡和环氧树脂复合,制备了三相复合材料。研究了氧化石墨的添加量对于复合材料介电性能的影响。结果发现在氧化石墨的添加量很少时,三相复合材料的介电常数显著地高于钛酸钡/环氧树脂两相复合材料,同时介电损耗仍然维持在较低的水平。钛酸钡/环氧树脂的介电常数为17.7(20℃,1 kHz),当加入3wt%氧化石墨,介电常数增加到42.6,介电损耗为0.043。因此该三相复合材料适合用于埋入式电容器的介质材料。最后初步探讨了氧化石墨对复合材料介电性能的影响机理。

Polymer-based dielectric composites have important applications in the fields of power engineering, microelectronics and high-density packaging. In this study, graphite oxide was prepared through oxidizing nature graphite ？akes with concentrated sulfuric acid and potassium permanganate. And graphite oxide/barium titanate/epoxy resin （GO/BT/ER） three-phase composites were prepared. Dielectric performance of the composites with varied GO loading amounts was investigated. The experimental results showed that the GO/BT/ER composites with low GO loading amount exhibited higher dielectric constant than that of BT/ER and the dielectric loss remained low. The dielectric constant of 3wt%GO/BT/ER composite was 42.6 and the dielectric loss was 0.043 （20℃, 1 kHz）, while the dielectric constant of the BT/ER composites was 17.7. Therefore, the GO/BT/ER composites are promising candidates for the embedded dielectrics. Furthermore, the mechanism of graphite oxide on the dielectric properties of the composites also explored.