Dynamical processes in a superpressed glass-forming liquid studied by dielectric spectroscopy

Dielectric measurements of poly(bisphenol A- co -epichlorohydrin), glicydyl end-capped have been carried out at pressures from 0.1 MPa to 350 MPa. Two different types of relaxation phenomena, namely primary (α) and conductivity relaxation have been studied. It was found that conductivity relaxation (reflecting translational diffusion of mobile ions) is decoupled from α-relaxation. Pressure dependences of the characteristic relaxation time for both processes obey the following law: τ = τ 0 exp [ C p P / P 0 − P ].