Hydrodynamic and conformational properties of cellulose acetomyristate

For a series of cellulose acetomyristate samples with similar degrees of su bstitution of the myristic acid groups (230-280), the intrinsic viscosity e ta and the buoyancy (-s) and translational diffusion D coefficients in chlo roform were measured. The effects of excluded volume and draining of the ce llulose acetomyristate molecules on the values of (-s(0)) and their depende nce on molecular mass in the interval of molecular masses M = = (78.5-777) x 10(3) were examined. For the polymer under study, the length of the Kuhn statistical segment is A = 120 x 10(-8) cm, and the excluded-volume paramet er in chloroform is epsilon = 0.34. The temperature dependence of the intri nsic viscosity observed for cellulose acetomyristate is typical of rigid-ch ain polymers. For the cellulose acetomyristate samples under study, the ene rgy hindering intramolecular rotations around the valence bonds of polygluc oside chains was calculated, and the temperature dependence of this energy was studied.