EFFECT OF HIGH-TEMPERATURES ON THE DIELECTRIC BEHAVIOR OF VISCOSE FIBERS AT LOW-FREQUENCY

Commercial and purified viscose fibres exhibit dielectric dispersion a nd a loss peak within the frequency range 0.05-1 k c/s and at temperat ures of 80-140 degrees C. Such high temperature relaxation is local in nature and is attributed to side group motion. The characteristics of the absorption bands of these samples are compared and the results ob tained are interpreted. The variation of the dielectric constant with temperature showed a second order transition at about 110 degrees C wi th these samples, which disappears on hydrolysis.