聚丙烯压电驻极体的振动能量采集研究  

Vibration-based energy harvesting with polypropylene

作　　者：武丽明[1] 张晓青[1] 

机构地区：[1]同济大学物理科学与工程学院,上海市特殊人工微结构材料及技术重点实验室,上海200092

出　　处：《功能材料》2016年第8期8074-8078,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51173137,11374232);中央高校基本科研资助项目(同济大学2014)

摘　　要：以线性聚丙烯(PP)为原材料,经压缩气体膨化处理和电晕极化处理后,使其具有压电效应,并将其应用在振动能量采集器中。结果表明,PP压电驻极体在厚度方向上的弹性模量和机械品质因数(FOM,d33·g33)分别为1.7 MPa和8.4GPa^(-1),利用面积为3.14cm^2单层膜进行能量采集,当振子质量为25.6,33.7和57.7g时,其共振频率分别为2 300,2 000和1 800 Hz,在各自的匹配负载条件下,获得的输出功率分别为10.1,13.2和16.9μW/g^2。将两片PP膜电学串联,当振子质量为33.7g时,在共振频率1 400Hz和匹配负载4.3 MΩ的条件下,可以获得的输出功率为15μW/g^2。Cellular polypropylene （PP） films were rendered piezoelectric after pressed gas expansion treatmentand proper polarization, and applied in vibration energy harvesters. The results show that Y oungm odulus inthickness direction determined from dielectric resonance spectra, and the figure of merit FOM （d 33 · g 33 ） are1.7 MPa and 8.4 GPa-1 , respectively. For a PP film sample with a quasi-static piezoelectric d23 coefficient of 280 pC /N , area of 3.14 cm2, and capacitance of 59 pF at 1 000 Hz, a normalized output power of 16.9 juW/g2 was obtained under conditions of a seismic mass of 57.7 g, a matched load resistance of 2.4 M 0 9 and a resonancefrequency of 1 800 Hz. Two pieces of PP films were in electrical series, the capacitance is 25.4 pF in total. Theoutput power of 15 juW/g2 was obtained with an area of 3.14 cm2, a seismic mass of 33.7 g and a matched loadresistance of 4.3 MO. The piezoelectrets based energy harvesters may be used to power low-power electronics.

关 键 词：聚丙烯 压电驻极体 能量采集 

分 类 号：O469[理学—凝聚态物理]