Kinetics of electric destruction of polymer compositions

The dependence of the electrical durability tau(E) (time from the application of constant voltage until breakdown) on the temperature T (in the range of 77-300 K) at different values of the electric field strength E of polymer compositions of polypropylene and low-density polyethylene (PP-LDPE) with different supramolecular structures (SMS) was measured. At elevated temperatures (similar to above 200 K), the dependence of lg tau(E)(T-1) is linear, indicating a thermofluctuational mechanism of breakdown preparation; at low temperatures (similar to below 200 K) tau E does not depend on T, which will allow us to conclude about its tunneling mechanism. The transition temperature of the linear dependence of tau(E) on T lies in the similar to 200 K range and depends on the value of the applied constant electric field.