EFFECT OF HIGH-PRESSURE ON THE KINETICS OF RADIATION-INDUCED ELECTRIC-CONDUCTIVITY IN POLY(TETRAFLUOROETHYLENE)

Variation of the radiation-induced room-temperature electric conductiv ity in PTFE films depending on the extent of mechanical compression wa s studied on PTFE samples irradiated with gamma-quanta at a dose rate of 2.2 Gy/s. It was found that an increase in the pressure led to a co nsiderable decrease in the conductivity and a delay in the time of att aining the maximum conductivity level. The activation volume for the c harge mobility in PTFE samples during and after the irradiation are 90 and 40 cm(3)/mol. It is concluded that the charge transfer is determi ned by large-scale molecular motions on the level of the Kuhn segment. Effects of the radiation-chemical transformations on the radiation-in duced conductivity kinetics in PTFE is discussed.