温度和湿度对聚四氟乙烯多孔驻极体膜压电活性稳定性的影响

功能材料, 2004, 35(1): 82-85.

温度和湿度对聚四氟乙烯多孔驻极体膜压电活性稳定性的影响

夏钟福 ^1, , 邱勋林 ^2, , 王飞鹏 ^3, , 吴越华 ^4, , 马珊珊 ^5,

1.同济大学,波耳固体物理研究所,上海,200092

2.同济大学,波耳固体物理研究所,上海,200092

3.同济大学,波耳固体物理研究所,上海,200092

4.同济大学,波耳固体物理研究所,上海,200092

5.同济大学,波耳固体物理研究所,上海,200092

基金项目: 国家自然科学基金(50073016) 德国大众汽车基金(Ref.I/77365)

关键词：多孔聚四氟乙烯膜 , 聚丙烯蜂窝膜 , 驻极体 , 压电性 , 温度稳定性 , 湿度效应

Influence of temperature and humidity on stability of piezoelectric activity for porous polytetrafluoroethylene (PTFE) electret film

研究了具有开放性孔洞的聚四氟乙烯(voided polytetrafluoroethylene, PTFE)多孔膜和PP蜂窝膜(polypropylene cellular)的驻极体行为和压电活性的温度效应.研究结果指出:和PP蜂窝膜驻极体相比,PTFE多孔膜驻极体呈现出突出的电荷储存和压电活性的温度稳定性;研究了这类稳定性的驻极体和材料的结构根源.PTFE多孔薄膜驻极体这种压电活性的温度稳定性主要依赖于这类驻极体材料电荷储存及材料的本征性能(如力学性质等)的温度稳定性.实验结果还说明:PTFE多孔膜突出的压电系数温度稳定性使它大大扩展了以包括PP在内的空间电荷型多孔膜研制的压电功能元器件的耐温要求.本文还讨论了环境因素(如相对湿度)对这类功能膜压电活性的影响,分析了环境湿度对压电活性影响的结构根源.

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