ANALYSIS OF POLYMER HETEROGENEITY BY SEDIMENTATION TRANSPORT .2. CARBOXYMETHYL CELLULOSE IN A WATER CADOXENE MIXTURE

Sedimentation velocity data obtained for solutions of monosubstituted carboxymethyl cellulose samples with molecular weights from 1.2 x 10(5 ) to 3.8 x 10(5) in a water/cadoxene mixture were used to determine th e heterogeneity parameters. Linear dependence has been established for the x-spectrum standard deviation of the distribution of macromolecul es in the ultracentrifugal field, as a function of the sedimentation b oundary shift. This result proved the applicability of the novel metho d for elimination of the diffusion and concentration effects by a more reliable and convenient method than other known methods. The paramete r M(z)/M(w) for different polymer samples was determined to lie betwee n values of 1.8 and 3.5.