Dielectric Properties of Electrically Aged Low Density Polyethylene

摘要

Low density polyethylene (LDPE) films kept in a sodium chloride aqueous solution, were aged under a high AC electrical field. The films were prepared form press moulding of LDPE pellets with small amounts of antioxidants. The dielectric spectra at 30 deg. C in the range of 10~-5 Hz to 10~5 Hz were obtained prior and after ageing. Three different experimental techniques were used to obtain the full spectrum . For the low frequency (LF) region (10~-5 Hz to 10~-1 Hz) the time domain technique was used (charge and discharge currents were also measured).