Piezoelectric Composite with Thermoplastic Polymer Matrix

摘要

The use of thermoplastic polymers in piezoelectric composites enables flexible manufacturing methods, like e.g. injection moulding, in the production of large, complex and cost efficient 3D structures. In this work, piezoelectric composites with 0-3 connectivity were fabricated from a commercial PZT powder and thermoplastic cyclo-olefin copolymer (COC). The composites with different ceramic loadings and carbon black addition were made by a mixing extruder. Electrical and electromechanical properties of the composites like remnant polarisation, relative permittivity, displacement and piezoelectric d33 coefficient were measured and the microstructure were analysed. The results showed that the addition level of carbon black increases the remnant polarisation, relative permittivity and dielectric loss, while very small effect on the d33 coefficient was obtained. The measured properties of piezoelectric composite with thermoplastic polymer matrix are very competitive with the pure piezoelectric polymers.