HYDRODYNAMIC PROPERTIES AND CONFORMATIONA L CHARACTERISTICS OF CYANOETHYL HYDROXYPROPYL CELLULOSE

The centrifugal sedimentation and diffusion of macromolecules of cyano ethyl hydroxypropyl cellulose (CEHPC) with the average degree of subst itution 2.4 +/- 0.3 was studied using dilute CEHPC solutions in variou s solvents. In the range of molecular masses 130 x 10(3) - 580 x 10(3) , the sedimentation coefficient and intrinsic viscosity of CEHPC at 26 degrees C are related to the degree of polymerization by the formulas s(0) = (6.0 +/- 0.7) x 10-(14)Z(0.40+/-0.02)c and [eta] = (1.4 +/- 0. 3)Z(0.89+/-0.03) ml/g. The equilibrium rigidity of a macromolecule is characterized by the Kuhn segment A = (430 +/- 50) Angstrom and the pa rameter of retardation sigma = 6 of intramolecular motion. The hydrody namic diameter of the chain is d = (23 +/- 6) Angstrom.