Synergistic effect of electric field and temperature on the ageingof LPDE in contact with electrolyte solution

摘要

The synergistic effect of electric field and temperature on thenageing of low-density polyethylene (LDPE) was studied by thermallynstimulated creep spectroscopy and Fourier-transform infrarednspectroscopy, using deionized H₂O and NaBr as electrolytes.nInsulating polymeric materials generally consist of a mixture of orderedncrystals and amorphous regions, resulting in interphase paracrystallinendomains and/or rigid amorphous domains stressed by crystallites.nStresses such as electrical and environmental conditions influence thenmolecular mobility of the disordered phases, ultimately allowing thenageing process to be quantified. Ageing was carried out for 1000 h undern10-kV, 50-Hz voltage at 75° C and 50° C for NaBr. The effects onnthe compensation lines, the enthalpy, and the behavior of the rigidnamorphous phase were studied. The synergistic effect is shown byncomparing the results with the zero phase behavior