ABSTRACT

Dielectric property is a crucial characteristic of electronic materials and piezoelectric materials. In this study, the piezoelectric composites of polycaprolactone mixed with nano-barium titanate were fabricated. The nano-barium titanate was modified by biosurfactant lecithin to disperse well in the polycaprolactone matrix. The dielectric property of this composite was supplied. In particular, the dielectric constant of the composites was calculated by different theoretic models. The experimental data confirmed that the rotating ellipsoidal theoretical model is suitable for polycaprolactone/nano-barium titanate composites. The composites have weak piezoelectric properties because of the nano-barium titanate addition. It is noteworthy that the flexural strength is improved by two times. The mechanism of the improvement was analysed. The composite has potential applications in the field of flexible and degradable wearable electronics.

摘要

介电特性是电子材料和压电材料的关键特性。本研究制备了聚己内酯与纳米钛酸钡混合的压电复合材料。纳米钛酸钡被生物表面活性剂卵磷脂修饰，以很好地分散在聚己内酯基质中。提供了该复合材料的介电性能。特别地，通过不同的理论模型来计算复合材料的介电常数。实验数据证实，旋转椭球理论模型适用于聚己内酯/钛酸钡纳米复合材料。由于添加了纳米钛酸钡，该复合材料的压电性能较弱。值得注意的是，抗弯强度提高了两倍。分析了改进的机理。