多孔聚丙烯压电驻极体薄膜压电d_(33)系数的优化  

Improvement of piezoelectric d_(33) coefficient for cellular polypropylene films

作　　者：张晓青[1] 王飞鹏[1] 黄金峰[1] 夏钟福[1] 安振连[1] 

机构地区：[1]同济大学波耳固体物理研究所,上海200092

出　　处：《仪器仪表学报》2006年第z3期2481-2482,共2页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(05053018);上海市自然科学基金(05ZR14125)

摘　　要：本文报道利用在电极化之前和电极化之后的两次气体膨化工艺来优化多孔聚丙稀(PP)压电驻极体薄膜的压电d33系数。将样品进行电极化之前的一次气体膨化处理,多孔PP膜的压电d33系数从接近于0增长到800 pC／N左右,压电活性的增大是因为膨化膜杨氏摸量(Y)的降低和电极化能力的提高;若将样品进行电极化之后的二次气体膨化处理,其压电活性可以进一步提高40％,是因为薄膜在真空蒸镀电极过程中导致的厚度减小能够通过二次膨化工艺得到恢复。而厚度的增加可以有效的降低材料的杨氏模量,从而使薄膜的压电d33系数增加。经两次膨化工艺后的典型压电d33系数为1400 pC／N(f< 0．01 Hz)和500 pC／N(f<25 kHz)。The piezoelectric d33 coefficients of cellular polypropylene (PP) films can be improved significantly by the twice—thickness—expansion processes. After the thickness expansion treatment before corona charging, the values of d33 coefficients increase up to around 700 pC/N;d33 coefficients can be further improved by the factor of 40% by using the second thickness expansion after corona charging and metallization. The huge increase of d33 coefficients of cellular PP films after the first thickness expansion is due to the reduction of the Young's modules and the enhance of charging ability, while the effectiveness of the second expansion must be attributed to the gain in thickness. Typical d33 coefficients of 1400 pC/N at 0. 01 Hz and about 500 pC/N at 25 kHz have been achieved.

关 键 词：压电 驻极体 膨化 多孔 薄膜 

分 类 号：TH7-55[机械工程—仪器科学与技术]