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The Effect of (2-hydroxypropyl)-betacyclodextrin on Rheology of Hydorphobically end-capped Poly(ethylene glycol) Aueous Solutions
Authors: Horský Jiří | Mikešová Jana | Quadrat Otakar | Šňupárek Jaromír
Year: 2004
Type of publication: článek v odborném periodiku
Name of source: Journal of Rheology
Publisher name: American Institute of Physics
Place: STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA
Page from-to: 23-28
Titles:
Language Name Abstract Keywords
cze Vliv (2-hydroxypropyl)-beta-cyclodextrinu na reologii hydrofobně ukončených polyethylenglykolu Byly studovány změny tokového chování modifikovaného cyklicého oligosacharidu ve vodných roztocích modelového telechlického a asociativního polymeru. associative triblock copolymers; beta-cyclodextrin polymers; ethoxylated urethanes; micellar-solutions; complex-formation; phase-separation; light-scattering; oxide; water; model
eng The Effect of (2-hydroxypropyl)-betacyclodextrin on Rheology of Hydorphobically end-capped Poly(ethylene glycol) Aueous Solutions 2-Hydroxypropyl)-beta-cyclodextrin (HPBCD), a modified cyclic oligosaccharide, changes the flow behavior of aqueous solutions of a model telechelic associative polymer, hydrophobically end-capped poly(ethylene glycol) (ODU-12), because the inclusion complexation of HPBCD and octadecyl end-capping groups interferes with aggregation of the polymer end groups. The HPBCD-induced decrease in the high-frequency modulus can be well described assuming a 1:1 binding isotherm, but cannot fully explain the decrease in the low shear rate Newtonian viscosity, because HPBCD also strongly decreases the relaxation time. Consequently, besides decreasing low shear rate Newtonian viscosity, HPBCD also extends the Newtonian behavior to higher shear rates as predicted by the free-path version of the transient network theory [Marrucci et al., Macromolecules 26, 6483-6488 (1993)]. (C) 2004 The Society of Rheology. associative triblock copolymers; beta-cyclodextrin polymers; ethoxylated urethanes; micellar-solutions; complex-formation; phase-separation; light-scattering; oxide; water; model

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