Trap characteristics of zeolite/LDPE nanocomposites investigated by difference method

Zeolite/low-density-polyethylene (LDPE) nanocomposites with introduced high density traps to suppress space charge accumulation are achieved by filling 1 and 3 wt% NaY zeolite nanoparticles into LDPE. The conduction current and trap level distribution are analyzed by the isothermal discharge current method. The results indicate that the conduction current and trap level density is significantly higher in comparison with LDPE and increase with NaY-zeolite nanofiller concentration. The space charge tests demonstrate that the NaY-zeolite nanofillers can effectively reduce the conductivity and inhibit the space charge accumulation in zeolite/LDPE nanocomposites at high electrical field. A new method utilizing isothermal space charge decay measurement is proposed to calculate the trap characteristics, which can avoid measurement error in pA current. The calculated results suggest that trap level density of LDPE is improved by nanozeolite. The trap parameters obtained by the new method is consistent with the pA current test, which indicates that space charge distribution can efficiently applied to the analysis of charge trap characterization. In addition, the isothermal space charge decay method verifies the reliability of the space charge distribution test for LDPE nanodielectrics.

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