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用作空耦超声换能器的聚丙烯多孔膜驻极体的压电性能

Piezoelectric properties of cellular polypropylenepiezoelectrets usedas air-coupled ultrasonic transducers
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摘要 以初始厚度为50μm的国产聚丙烯(PP)多孔膜(PQ50)为原材料,通过微结构调控制备了不同厚度的压电驻极体膜,并对比研究了其与芬兰VTT开发的商用PP多孔压电驻极体膜HS70的压电和声学性能。结果表明薄膜的杨氏模量与厚度呈U型依赖关系,杨氏模量在厚度为60~65μm时出现谷值。PP压电驻极体膜的极化呈现阈值行为,在阈值电压以上,压电d_(33)系数随着极化电压的上升而显著增加。当极化电压为6kV时,厚度为60μm的PQ50多孔膜d_(33)达355pC/N,而HS70的d_(33)系数为179 pC/N。在1~10N的静态力范围内,两类PP多孔膜驻极体的压电d_(33)系数先下降后趋于平稳。以PQ50(厚度60μm)和HS70为振膜制作的超声换能器,其振幅分别为170和26 mV,带宽分别为320和180 kHz,因此,国产PQ50薄膜经微结构调控处理后表现出优于商售VTT薄膜的压电与声学性能。 In this paper,cellular PP piezoelectret films with different thicknesses were prepared by microstructure control on home-made PP foams(PQ50),and their piezoelectric and acoustic properties were compared with those of commercial cellular PP piezoelectrets(HS70)developed by VTT in Finland.The results show that the Young’s modulus of cellular PQ50 films exhibits a U-shaped dependence on the film thickness,and the Young’s modulus reaches the minimum around the thickness range of 60~65μm.The polarization of the PP piezoelectret films exhibits a threshold behavior.Above the threshold voltage,the dynamic piezoelectric d_(33)coefficient increases significantly with increasing poling voltage.For a poling voltage of 6kV,the d_(33)of PQ50 cellular film with a thickness of 60μm reaches 355pC/N,while the d_(33)coefficient of HS70 is 179pC/N.Within the static force range of 1~10N,the dynamic piezoelectric d_(33)coefficient of two kinds of PP cellular piezoelectret films first decreases and then tends to be stable.Ultrasonic transducers based on optimized PQ50 and HS70 show amplitudes of 170 and 26mV and bandwidths of 320 and 180kHz,respectively.Therefore,the home-made PQ50 film with optimized micro-structure shows better piezoelectric and acoustic properties than the commercial VTT film HS70.
作者 刘佳雯 邱勋林 边裕清 朱武军 项延训 LIU Jiawen;QIU Xunlin;BIAN Yuqing;Zhu Wujun;XIANG Yanxun(School of Mechanical and Power Engineering,East China University ofScience and Technology,Shanghai 200237,China)
出处 《功能材料》 CAS CSCD 北大核心 2023年第9期9133-9137,共5页 Journal of Functional Materials
基金 国家重点研发计划项目(2021YFC3001802) 国家自然科学基金项目(12174102,12025403)。
关键词 压电驻极体 聚丙烯多孔膜 空气耦合超声换能器 压电d 33系数 中心频率 带宽 Piezoelectret cellular PP film air-coupled ultrasonic transducer piezoelectric d 33 coefficient resonance frequency bandwidth
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