Abstract
Dielectric studies are reported on cellulose acetate doped with glycerol. The addition of glycerol initially leads to the generation of a strongly interacting layer manifest by an increase in the amplitude of the side chain motion of the cellulose acetate and also the appearance of a higher temperature relaxation. Further addition of glycerol allows development of a multilayer situation which has relaxation properties similar to that of pure glycerol and is essentially independent of the cellulose acetate matrix. The high temperature conductivity of the samples investigated is critically dependent on the concentration of the dopant, increasing markedly for concentrations above 2–3%. This change in behaviour appears to correlate with the fibrillar surface area and is associated with the generation of proton conduction in the system. The general characteristics of this behaviour are similar to those previously reported 1 for the addition of water to cellulose derivatives.
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