DIELECTRIC BEHAVIOR OF CYANOETHYLATED CELLULOSE

The dielectric characteristics of cyanoethylated cellulose samples hav ing different degrees of substitution have been investigated at differ ent frequencies from 0.1 to 10 kHz and at temperatures from -40-degree s-C to 180-degrees-C. Two relaxation processes, designated as alpha an d beta in order of decreasing temperature, were recognised. The low te mperature beta-relaxation is expected to be due to local motion of anh ydroglucose rings, while the alpha-relaxation is related to the side g roup motion. The data obtained are discussed in terms of the progressi ve destruction of the fibre structure, together with the increase of s ide group polarity due to cyanoethylation.