Decay of space charge in LDPE and its blend polymer

In this paper, the decay characteristics of space charge under the short circuit for low-density polyethylene (LDPE) and blend polymer of LDPE and polypropylene copolymer were investigated by the pulsed electro-acoustic method. The decay processes for both, LDPE and the blend polymer, have two time constants which suggest the existence of two kinds of traps. The activation energy was estimated from the relationship between decay time constant and temperature. Two activation energies corresponding to the two time constants increase by blending polypropylene copolymer with LDPE. It suggests the deepening of trap depth by blending which is consistent with the previous work. (author)