Interfacial charge behavior in SXLPE/XLPE laminate

Space charge distributions in silane crosslinked polyethylene (SXLPE)/crosslinked polyethylene (XLPE) laminates were investigated using a pulsed electroacoustic (PEA) method. XLPE shows heterocharge while SXLPE shows homocharge. Positive charge is accumulated at the interface of SXLPE/XLPE laminate when the applied electric field is more than 20 kV/mm. The charge profile at various temperatures was also acquired using a temperature-controllable PEA system. Although the applied electric field is only 8.6 kV/mm, positive interfacial charge starts to appear near 50/spl deg/C.