Abstract
The electrical birefringence of cyanoethyl cellulose fractions in an impulse field of constant, sinusoidal strength has been studied. From a comparison of the experimental dependence of the specific Kerr constant on MM with the theoretical curve for the persistent chain model, the dipole moment of the repeating unit, μ 0 = 1 D and the angle between the dipole and the tangent to the chain contour of 65° were determined. The relaxational dependencies of birefringence on time and the dispersional dependences on the frequency were studied and the times of orientational relaxation τ of cyanoethylcellulose macromolecules of different MM were found. The relation between τ, MM and intrinsic viscosity indicated the presence of a noticeable kinetic flexibility of rather long cyanoethyl cellulose chains, discovered earlier for polymeric cellulose carbanilate and cellulose nitrates.
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