Relaxation behavior in polarized PVDF films under the influence of mechanical and thermal multistresses above glass-transition temperature

摘要

The discharging currents in cast-prepared PVDF films are measured under the influence of mechanical and thermal multistresses. Analysis of the experimental data in the framework of the Kohlrausch-Williams-Watt's function is carried out. A Linear relationship between the logarithm of the relaaxation time and the applied stress is verified, which is displayed as the mechanical offset stress increases. With the aid of the rate theory and the concept of the free volume, the activation volume, upsilon*, has been determined and is consistent with the reported value. (C) 1998 John Wiley & Sons, Inc. [References: 18]