Abstract
AbstractPrevious results on the hydrodynamic and configurational properties of fully acetylated guaran in acetonitrile have been reexamined in light of the recent Eizner‐Ptitsyn theory for the intrinsic viscosity of the semirigid macromolecule. Numerical values for the hydrodynamic function arising in the theory were calculated by numerical summation on an electronic computer and are tabulated. The theory is found to remove some of the inconsistencies inherent in earlier hydrodynamic theories and leads to reasonable values of the persistence length and monomeric friction coefficient of guaran acetate. The persistence length calculated from viscosity data was 57.8 A., only slightly lower than the limiting value of 64 A. obtained from light scattering. The ratio of monomeric friction coefficient to solvent viscosity was ζ/η0 = 6πr0 = 57.3 A., from which a value of r0 = 3.04 A. was obtained for the hydrodynamic radius of the monomer unit.
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