OPTICAL-DYNAMIC, AND ELECTRIC PROPERTIES OF SOLUTIONS OF CELLULOSE CARBANILATE IN DIOXANEE AND ETHYL-ACETATE

Flow birefringence, equilibrium and nonequilibrium electric birefringence in solutions of cellulose carbanilate (CC) in dioxane and ethyl acetate were studied over a wide range of molecular masses. The values of optical anisotropy DELTAa of the monomer unit of cellulose carbanilate in dioxane and in ethyl acetate were found to be -40 x 10(-25) cm3 and -18 x 10(-25) cm3, respectively. From the measurements of nonequilibrium electric birefringence of low-molecular-mass fractions in a dioxane solution of cellulose carbanilate, we estimated the length of the Kuhn statistical segment A to be (250 +/- 50) x 10(-8) cm. Calculations based on the dependence of the Kerr constant on the chain length gave, for the length of the Kuhn statistical segment of cellulose carbanilate in dioxane solution, the value of (225 +/- 25) x 10(-8) cm. It was shown that the contribution of the transverse component of the dipole moment of the monomer unit in electric birefringence is small. The values of longitudinal components of dipole moments of cellulose carbanilate monomer unit in dioxane and ethyl acetate solutions were found to be 0.91 and 1.3 D, respectively. The results obtained suggest that there is a correlation between the orientations of the polar bonds of the polymer chain and orientations of dipole moments of ethyl acetate molecules.