DIELECTRIC-PROPERTIES OF AMORPHOUS CELLULOSE-ACETATE BUTYRATE POLYMER-FILMS

The dielectric constant, loss tangent and AC conductivity of solution grown cellulose acetate-butyrate films of 5 mum thickness were studied as a function of temperature (300-450 K) in the frequency range 10 Hz -10 MHz. The decrease in dielectric constant was observed with the inc rease in frequency as well as with temperature. A loss peak was observ ed in the dielectric loss spectra and was identified as the beta-relax ation peak. The frequency-dependent conductivity was also studied. The results were interpreted in terms of electronic conduction via hoppin g processes.