Abstract
Flow birefringence, diffusion and characteristic viscosity in solutions of 14 fractions of highly substituted cellulose nitrate with a percentage content of nitrogen of 13·2% have been studied. The experimental dependence of reduced birefringence [n]/[η] and the characteristic angles of orientation [χ/g] on the molecular mass of cellulose nitrate found is interpreted in the light of the Noda-Hearst theory for kinetically flexible chains taking into account polydispersity in molecular masses. The dynamo-optical and hydrodynamic data obtained are used to determine the equilibrium and kinetic rigidity, anisotropy of the monomer unit and polydispersity of the fractions of cellulose nitrate. The effect of the microform in study of flow birefringence is shown in five solvents differing in refractive indices.
Published Version
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