J Mater Sci Technol ›› 2004, Vol. 20 ›› Issue (04): 441-444.

• Research Articles • Previous Articles     Next Articles

Preparation and Electromechanical Properties of PVDF Matrix Piezoelectric Composites Containing Highly Oriented BaTiO3 Whiskers

Xuetao LUO, Lifu CHEN, Xiaojun CHEN, Qianjun HUANG   

  1. Department of Materials Science and Engineering, Xiamen University, Xiamen 361005, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2004-07-28 Published:2009-10-10
  • Contact: Xuetao LUO

Abstract: The piezoelectric composites containing highly oriented BaTiO3 whiskers as active phase and PVDF as matrix have been prepared by micro-hole extrusion and orientation in carried fibers. The morphology of oriented BaTiO3 whiskers and microstructure of the composites were observed by SEM. As for its electromechanical properties, it is found that the dielectric constant, piezoelectric constant and remnant of polarization in the BaTiO3 whisker-PVDF composite are considerably higher than that in the BaTiO3 powders-PVDF composite, while the loss factors follow the opposite trend. For the BaTiO3 whisker-PVDF composite, the values of ε, d33 and Pr parallel to the whisker orientation (normal specimen) are much higher than that perpendicular to the whisker orientation (parallel specimen). The significant effects of the connective passages of active phase on electromechanical properties of the piezoelectric composites has also been investigated.

Key words: Piezoelectric composite, BaTiO3 whiskers, Electromechanical properties