Ur. Salamova et al., INVESTIGATIONS OF AQUEOUS-SOLUTIONS OF DEXTRAN-POLY(ETHYLENE GLYCOL) AND DEXTRAN-POLY(VINYL PYRROLIDONE) NEAR THE BINODIAL CURVE, Polymer, 37(11), 1996, pp. 2191-2194
The dependences of the refractive indices of aqueous solutions of dext
ran (D), poly(ethylene glycol) (PEG), and poly(vinyl pyrrolidone) (PVP
), and D-PEG and D-PVP mixtures, on the polymer concentration has been
investigated in order to study structural and conformational changes
as a function of the increasing polymer concentration. It is shown tha
t in contrast to solutions of single polymers, conformational changes
are not observed in aqueous solutions of mixed polymers, even at high
concentrations, and the phase separation which is observed is due to a
change of structure or state of the water. We have determined the rat
es of the processes of the phase separation in these aqueous biphasic
polymer systems. Copyright (C) 1996 Elsevier Science Ltd.