用时域方法在低频范围研究了涤纶、聚丙烯、线性低密度聚乙烯、绝缘纸等聚合物材料的介电谱，结果发现随着温度的升高，聚合物的慢极化出现多弛豫机构，而且介电响应函数有别于传统的经验公式。慢极化弛豫机构来源于空间电荷和缺陷的扩散，宏观表现为吸收电流，用时域微分谱可解释这一结果 The dielectric spectra of polymer materials such as polyester, polypropylene, linear low density polyethylene and insulating paper were studied in the low frequency range by using time domain method. It was found that with the increase of temperature, , And the dielectric response function is different from the traditional empirical formula. The slow-polarization relaxation mechanism is derived from the diffusion of space charges and defects, macroscopically as current absorption, and can be explained by time-domain differential spectroscopy