Sedimentation velocity data obtained for solutions of monosubstituted carboxymethyl cellulose samples with molecular weights from 1.2 x l0 s to 3.8 x l0 s in a water/cadoxene mixture were used to determine the heterogeneity parameters. Linear dependence has been established for the x-spectrum standard deviation of the distribution of macromolecules in the ultracentrifugal field, as a function of the sedimentation boundary shift. This result proved the applicability of the novel method for elimination of the diffusion and concentration effects by a more reliable and convenient method than other known methods. The parameter M,JMw for different polymer samples was determined to lie between values of 1.8 and 3.5.
Посилання на статтю:
Analysis of polymer heterogeneity by sedimentation transport: 2. Carboxymethyl cellulose in a water/cadoxene mixture / Peter N. Lavrenko* and Olga V. Okatova // Polymer. – 1994. – Vol 35. – P. 2137-2140.