【摘要】 研究了经压力膨化后的热处理温度对聚丙烯蜂窝膜(cellular PP)驻极体机电性能的影响.结果表明,在从常温至PP熔融温区内,压力膨化工艺处理后PP蜂窝膜的厚度随着热处理温度的升高而逐渐增大;然而热处理温度对PP蜂窝膜的压电活性及其相关性质的影响具有显著不同的规律,在90℃时,PP蜂窝膜的弹性模量和机电耦合系数分别出现谷值和峰值,同时压电d33系数达到377pC/N的最大值.随着热处理温度的升高,它们的谐振频率的变化范围约为794到371kHz.更多还原

【Abstract】 The influence of heat treatment temperature after the pressure expansion on the electromechanical properties of cellular polypropylene (PP) electret is studied. The results point out that over the temperature range form RT to the melting temperature of the sample, the thickness of the sample after pressure expansion increases with the heat treatment temperature. Compared to that mentioned above, obviously different influence of heat treatment temperature on the electromechanical properties of cellular PP is observed. The elastic modulus and electromechanical coupling factor of cellular PP electret reach minimum and maximum at 90℃ heat treatment temperature, respectively. As a result, the piezoelectric d_ 33 coefficient reaches its maximum of 377pC/N. Further, with the increase of heat treatment temperature, the resonance frequency of cellular PP could be regulated from about 794 to 371kHz.更多还原