研究了基于辐照交联聚丙烯（XPP）的压电驻极体功能膜的机电性能。利用介电谐振谱测定了XPP膜的弹性模量;通过准静态方法测量了该功能膜的压电系数d33及其压强特性曲线;对压电相应的时域谱进行了分析;最后讨论了该功能膜的力学疲劳特性。结果表明XPP压电驻极体膜的弹性模量为1.3MPa,压电系数d33在10～100kPa的压强范围内都具有良好的线性度;时域谱揭示了XPP膜的粘流特性;XPP膜的输出电压和压力呈现良好的线性关系;经历60万次的循环力载荷,压电系数d33没有明显的变化。
The electromechanical properties of the piezoelectrets based on the irradiation cross-linked polypropylene（XPP） were investigated.The modulus of elasticity of the XPP films were determined from the dielectric resonance spectra.The piezoelectric d33 coefficients in such piezoelectret films were measured by using quasi-static method.The time spectrum of piezoelectric response was analyzed.The experiments of the mechanical fatigues in the XPP piezoelectret films were also taken.The result shows that the modulus of elasticity of the XPP films is around 1.3MPa.The d33-coefficients exhibit good linearity in the range of applied pressure from 10 to 100kPa.The time spectrum of piezoelectric response reveals a viscous flow feature in XPP films.The relation between the output voltage and applied force is linear.No significant change in d33 coefficients was observed after 600 thousand cycles of applying force.
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