Time dependence of the aggregation of star-shaped poly(2-isopropyl-2-oxazolines) in aqueous solutions
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The paper concerns the analysis of time t eq required to equilibrium state achievement in aqueous solutions of star-shaped poly(2-isopropyl-2-oxazolines) (PiPrOx) after changing temperature. The discussed data were obtained for PiPrOx differing in arm number and length. For all samples, high t eq values, half an hour at least, were obtained because of rather high intramolecular density. The dependence t eq on temperature displayed maximum near the phase separation beginning due to the aggregate growth and redistribution of scattering particles. The maximum times t eq increased symbatically with arm number and length. The higher energy of the hydrogen bond formed by deuterium isotope leads to the growth of the t eq values as compared to solutions in H2O.
KeywordsThermosensitive polymer Kinetic poly(2-isopropyl-2-oxazolines) Phase separation Aggregation
The financial support was provided by the Russian Science Foundation (project no. 14-13-00231).
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