THERMALLY STIMULATED DEPOLARIZATION STUDY OF POLYMER RELAXATION PARAMETER DISTRIBUTIONS AT NORMAL AND HIGH-PRESSURES

An analysis has been performed of the thermally stimulated depolarization (t. s. d. ) currents in the vicinity of the glass transition temperature (T//g) of poly(vinyl chloride), poly(vinyl acetate), poly(methyl methacrylate), poly(trifluorochloroethylene) and nylon-6 at hydrostatic pressures ranging from 0. 1 to 200 MPa. A technique for the transformation of t. s. d. curves into relaxation parameter distributions has been developed and substantiated. On the basis of this technique, the distributions of glass transition temperatures, relaxation times, frequency factors and activation energies and volumes were studied. It was shown that the distributions of all relaxation parameters are adequately described by exponential functions.