FEP和多孔PTFE复合膜铁电驻极体的压电性及电荷动态特性  

Piezoelectricity and charges dynamic properties of fep and ptfe laminated films

作　　者：黄金峰[1] 张晓青[1] 万振茂[1] 陈剑波[1] 王姝[1] 王学文[1] 夏钟福[1] 

机构地区：[1]同济大学物理系波耳固体物理研究所,上海200092

出　　处：《功能材料》2007年第A02期741-743,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目（50503018）;上海市自然科学基金资助项目（05ZR14125）.

摘　　要：报道了将致密的FEP和多孔PTFE交互层叠在一起，采用热粘合的方法制备出具有孔洞结构的聚合物复合膜，然后经电晕极化处理使该复合膜成为铁电驻极体。最后用准静态方法测量该铁电复合膜的压电系数d33，并通过热刺激电流放电（TSD）电流谱和等温衰减研究了FEP和多孔PTFE复合膜铁电驻极体的电荷动态特性。结果表明：该复合膜的压电系数d33可达200～500pC/N，在0～12kPa的压强范围内呈现出良好的线性，并且在90℃下老化160min后仍保持在原来的43％且趋于稳定；FEP和多孔PTFE复合膜铁电驻极体电荷在热激发脱阱后复合途径主要有2种：一种是沿着固体介质的表面迁移与异性电荷复合，另一种是穿过固体介质层与异性电荷复合。在低温区（7512附近）前者占优，高温区（120℃附近）后者占优。This paper introduces a method of preparation of laminated polytetrafluoroethylene （PTFE） and fluoroethylenepropylene （FEP） films with cellular structure. After proper electric charging, the laminated films were made into ferroelectrets. The piezoelectric d33 coefficients of ferroelectrets were measured by the quasi-static method and their thermal stability was characterized by isothermal decay. The dynamic properties of the charges were investigated by the TSD current spectroscopy. The results show the quasi-static piezoelectric d33 coefficients of the ferroelectrets are up to 200-500 pC/N and relatively independent on the static applied pressure in the range of 12 kPa; after 160 min aging at 90℃ d33 of such ferroelectrets can retain 43% of the original value and tends to stabilization. There are two mainly routes of the detraped charges transportations, one is through the surface of the solid and the other is though the inside surfaces of the cavities.

关 键 词：铁电驻极体 FEP和多孔PTFE复合膜 热刺激电流放电(TSD) 压电系数 储电性 

分 类 号：O482.41[理学—固体物理]