P(VDF/CTFE)共聚物薄膜的驻极体行为

The electret nehavior of poly(vinylidene/chlorotrifluoethy-lene) (P(VDF/CTFE)) film

通过不同条件下的正负电晕充电,等温表面电位衰减测量,热刺激放电(TSD)电流谱分析和热脉冲技术,首次研究了偏氟乙烯(VDF)和三氟氯乙烯(CTFE)共聚物P(VDF/CTFE)的驻极体性质,结果指出:共聚物驻极体的空间电荷热稳定性明显优于PVDF;TSD谱分析说明这种材料驻极体也是极性驻极体,即体内同时包含有偶极和空间电荷。本文还对样品的正负电晕充电后的电荷储存稳定性做了对比;研究了材料的能阱分布,确定了样品在不同温度电晕充电时平均电荷重心的迁移规律。

By positively and negatively corona charging at room and elevated temperatures, measurements of surface potential decay, thermally stimulated discharge (TSD) current spectra in combination with heat pulse technology, the electret characters of the copolymer P(VDF/CTFE), polymerized from vinylidenefluoride (VDF) and chlorotrifluoroethylene (CTFE), have been first studied. The result points out: the space charge storage capability of P(VDF/CTFE) was significantly improved than that of PVDF. P(VDF/CTFE) was a polar material, namely, there exit both dipoles and space charges in the material. Moreover the space charge storage ability between positively and negatively corona charged samples has been compared; and the geometric distribution of traps was studied. Finally, the shift of mean charge depth at different charging temperatures has been investigated.