EFFECT OF MOLECULAR MOTIONS ON THE TRANSP ORT OF EXCESS CHARGE-CARRIERS IN POLYMERS

Experimental data on the temperature variation of nonstationary radiat ion-induced electric conductivity in some polymers, irradiated in the low-signal regime with a pulse duration of 0.3 ms, are analyzed. It is established that the activation energy of the effective frequency fac tor is close to that of retarded rotation of the molecular groups that serve as hopping centers for the charge carriers. A hypothesis is sug gested, which explains very low values of the effective frequency fact or in polymers (10(2)-10(4) s(-1) for the hopping frequency of 10(11)- 10(13) s(-1) in the charge transfer band) as compared to doped polymer matrices with the same hopping centers (where the frequency factor is not less than 10(8) s(-1)).