摘要
通过栅控恒压电晕充电,等温表面电位衰减测量,电荷TSD(chargeTSD)和热刺激放电(ThermallyStimulatedDis charge,TSD)电流谱分析,首次研究了以聚四氟乙烯(PTFE)为基的偏氟、四氟乙烯和六氟丙烯三元共聚物P(VDF TFE HFP)构成的双层膜的驻极体性质。TSD电流谱分析说明这种复合驻极体材料是极性驻极体,即体内同时包含有空间电荷和有序取向的偶极电荷。实验结果还指出:通过对双层膜系的PTFE面充电形成的驻极体的空间电荷热稳定性明显优于传统的铁电聚合物驻极体PVDF。适当提高充电温度和充电后的等温老化储存可以改善电荷稳定性,由于该三元共聚物的高弹性柔量(顺度)和双层膜拥有的优良电荷储存能力,其压电活性高于PVDF。
By negative corona charging with a grid at room and elevated temperatures, measurements of isothermal surface potential decay, thermally stimulated dis-charge(TSD) current spectra and charge TSD, the electret properties of the Poly(vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene)/polytetrafluoro-ethylene double layer film were first studied. The result points out that P(VDF-TFE-HFP)/PTFE double layer film was a polar electret material, i.e. there exist both dipoles and space charges in the material. The space charge storage stability of the double layer electret film charged at the side of PTFE is better than that of PVDF. The charge stability can be inhanced by means of reasonably increase charging temperature and prolong storage time under normal environmental conditions. The film has higher piezoelectricity than that of PVDF due to the higher space charge storage ability and excellent elastic compliance.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2004年第1期77-79,共3页
Journal of Functional Materials
基金
国家自然科学基金资助项目(500730160)
