DIELECTRIC CHARACTERISTICS OF LIGNIN AND SOME CELLULOSIC MATERIALS

The dielectric constant for lignin, wood pulp and cotton linters is st udied at different frequencies and temperatures. The dielectric consta nt epsilon' of wood pulp is higher than that of cotton linters and lig nin. Mixing of lignin with cellulosic materials increases their dielec tric properties. The dielectric constant reaches its maximum value at a ratio of lignin and pulp of 1:6. Crystallinity, degree of polymeriza tion (DP) and particle size of the tested materials play an important role on the dielectric properties. Increasing temperature of the teste d materials more than 40 degrees, decreases the dielectric constant.