Abstract
The dynamics of cellulose diacetate (CDA) in semidilute solution (1.4c* < c < 5c*) was investigated in a good and high-polarity solvent, dimethylacetamide (DMAc), by dynamic light scattering in the quiescent state at 30 °C. Two fast diffusion motions and a very slow diffusion motion were detected, all the behavior of which is not expected from the framework of dynamics for usual flexible polymers in good solvents. The fast (fast mode) and medium-fast (medium mode) motions gave the diffusion coefficients DF and DM as DF ∝ c0.40 and DM ∝ c0.55. Both were the cooperative diffusion motions, or the relaxations of concentration fluctuations in two types of coarse-dense structures, which were realized as a nest of structures in a dynamic sense in semidilute solution. However, the relaxation rates were suppressed by the long-ranged hydrogen-bond interaction between hydroxyl (OH) groups on CDA molecules, and the interactions brought the systems into the medium, not good, solvent state. The slow diffusion (slow mod...
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