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Hydrodynamic and optical investigations were performed on the binary dibutyl phthalate (DBP)-decalin liquid mixtures with the DBP content varying from 0 to 100%. This system may be suitable for modelling of the low-molecular-weight polymer behaviour in solution. Macro-characteristics of the system, such as medium viscosity and diffusivity, were evaluated in addition to the molar refraction and the...
We developed a system for acquisition and analysis of interference patterns from an analytical ultracentrifuge or a polarising diffusiometer. The system is the first of its kind to be based on highly sensitive Lebedev optical system. We also present a novel algorithm for automatic extraction of interference curves from photographs. The algorithm is fast, robust in the face of optical noise and may...
Translational diffusion and viscosity measurements were performed for poly[(4,4′-oxydiphenylene)pyromellitic amido acid] in DMF, LiCl/DMF, and 96% H 2 SO 4 solutions to characterise the rate of the polymer degradation in 96% H 2 SO 4 in comparison with its relative stability in organic solutions. The hydrodynamic data were obtained in different stages of hydrolytic...
The sedimentation velocity of hydroxypropyl cellulose acetate and cyanoethylhydroxypropyl cellulose molecules has been investigated in dilute solution in organic solvents. For these polymers, a linear dependence of the standard deviation of the displacement spectrum of macromolecules in an ultracentrifuge field on the sedimentation boundary shift was observed. The method of moments with linear approximations...
Treatment of experimental dependence of the translational friction coefficient on molecular weight, f(M), obtained for semi-flexible macromolecules, is discussed. A draining effect is significant for these chains and must be taken into account to determine the correct values of unperturbed dimensions of the macromolecule. For this purpose a new relation between the Flory factor P and the scaling exponent...
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