Electric field dependence of thermal activation energy in poly(4TBU)/poly(methyl)methacrylate blend

The temperature dependence of the electrical conductivity of poly(6-t-butyl-3,4-dihydro-2H-1,3-benzoxazine)/poly(methylmethacrylate) blend was investigated in the sandwich cell configuration. The activation energy for electrical transport was found to undergo a transition with increasing electric field. The I-V characteristics were nonlinear and obeyed the power law I prop V^m with m ap 2 at high fields. The behavior was attributed to a space charge limited conduction. The photocurrent action spectra of the blend was also studied using the modulated photocurrent technique.