Kinetics of electric destruction of polymer compositions

Abstract

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