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The near threshold "soft breakdown" measurements of PVC films conductivityare investigated. In a wide range of external electric field strength forvarious rather thick (>20 mkm) PVC films the resistance shows strongnonlinearity and seems to enter high conductive state close to the breakdownthreshold. For our "thick" films boundary conditions electrode surfacespecifics should not be so important as in thin polymer films experiments. Bothfast, instant mechanisms of nonlinearity, and effects of accumulation and delayresponce were observed. The phenomena corresponding to reversible transitionsin a state with rather high conductivity, seems to be similar to onesregistered earlier in thin layers of some broad-bandgap polymers. In a range ofrelatively low field intensity, far from a threshold breakdown, as a result ofreversible switches between normal and high resistivity states a polymer filmin a standard measuring cell formed a relaxation generator giving a loud enoughsound signal with frequency increasing with the increase of external field.

Conductivity states changes in plasticized PVC films near breakdown threshold voltages values