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通过原位聚合的方法合成了表面包覆钛酸钡的聚苯胺复合纳米颗粒(BT@PANI),并将该复合纳米颗粒作为填料制备了具有特殊结构的BT@PANI/EP三相复合材料。实验发现由于导电聚苯胺增强了界面极化,因此随着BT@PANI中PANI质量的增加(即BT在复合材料中的质量分数减少),该复合材料的介电常数也随之增加。当PANI的质量分数从0%增加至26%时,其介电常数也从17提高到了53,并且当BT@PANI中PANI的质量分数达到26%时,该复合材料并没有出现明显的渗流效应,且其导电率保持在1.64×10-6 S/m这一较低值。此外,当测量温度范围在60℃到100℃之间时,该复合材料的介电常数发生了明显的上升,这一现象可以说明随着温度的上升,导电聚苯胺、环氧分子链在Tg温度(90℃)下运动增强及钛酸钡在居里温度(120℃)下的相变共同产生了强烈的界面极化。
The BT @ PANI / EP composite was prepared by in-situ polymerization. The BT @ PANI / EP three-phase composites with special structure were prepared by using this composite nanoparticle as filler. The experimental results show that the dielectric constant of the composites increases with the increase of the PANI mass in BT @ PANI (ie, the decrease of mass fraction of BT in the composites) due to the enhancement of the interface polarization by the conductive polyaniline. When the mass fraction of PANI increased from 0% to 26%, the dielectric constant increased from 17 to 53, and when PANI mass fraction in BT @ PANI reached 26%, the composite did not show obvious seepage effect , And its electrical conductivity is kept at a lower value of 1.64 × 10 -6 S / m. In addition, the dielectric constant of the composites shows a significant increase when the measuring temperature is in the range of 60 ℃ to 100 ℃ .This phenomenon shows that as the temperature increases, the conductive polyaniline, the molecular chain of epoxy in the Tg The phase transition of barium titanate at Curie temperature (120 ℃) together with the increase of the temperature (90 ℃) produces a strong interface polarization.