氰酸酯/BaTiO_3复合材料的介电性能

Dielectric Property of BADCy/BaTiO_3 Composite

以双酚A型二氰酸酯为树脂基体,平均粒径为3μm的BaTiO3为功能填料,采用浇铸法研制氰酸酯复合电介质材料,考察了25℃,1MHz时氰酸酯/BaTiO3复合材料的介电性能。结果表明,BaTiO3含量的增加提高了材料的介电常数,减小了材料的介电损耗,并且最大填充量为体系总质量的60%,此时介电常数最大(15.823),介电损耗最小(0.0037);随着树脂转化率的增加,材料的介电常数先增大后减小,而介电损耗一直在减小;硅烷偶联剂γ-氨丙基三乙氧基硅烷(KH-550)显著改善了BaTiO3粒子在氰酸酯基体中的分散效果,提高了材料的介电常数,保持介电损耗不变。

The bisphenol-A dicyanate （BADCy）/BaTiO3 dielectric composite was prepared with casting. At 1MHz and 298K, the dielectric property of the composite was investigated systematically. The results show that with the increase of the BaTiO3 content, the dielectric constant （ε） of the composite increases, while the dielectric loss （tanδ） decreases. When the mass fraction of BaTiO3 is 60%, ε reaches its highest value （15.823） and tanδ gets to the lowest（0.0037）. Meanwhile, with the increase of the conversion of BADCy, e ascends at first, and then descended, while tanδ descends during the whole curing periods, Besides, the silane coupling agent γ-aminopropyl triethoxy silane （KH-550） can improve the dispersion of BaTiO3 particles, resulting in the enhancement of the dielectric property.