Ricardo, N. M.P.S., Ricardo, N. M.P.S., Costa, F. d. M.L.L., Bezerra, F. W.A., Chaibundit, C., Hermida-Merino, D., Greenland, B., Burattini, S., Hamley, I. W., Nixon, S. K. and Yeates, S. G.
Effect of water-soluble polymers, polyethylene glycol and poly(vinylpyrrolidone),on the gelation of aqueous micellar solutions of Pluronic copolymer F127.
Journal of Colloid and Interface Science, 368 (1).
To link to this article DOI: 10.1016/j.jcis.2011.10.062
The micellization of F127 (E98P67E98) in dilute aqueous solutions of polyethylene glycol (PEG6000 and
PEG35000) and poly(vinylpyrrolidone) (PVP K30 and PVP K90) is studied. The average hydrodynamic
radius (rh,app) obtained from the dynamic light scattering technique increased with increase in PEG concentration
but decreased on addition of PVP, results which are consistent with interaction of the micelles
with PEG and the formation of micelles clusters, but no such interaction occurs with PVP. Tube inversion
was used to determine the onset of gelation. The critical concentration of F127 for gelation increased on
addition of PEG and of PVP K30 but decreased on addition of PVP K90. Small-angle X-ray scattering
(SAXS) was used to show that the 30 wt% F127 gel structure (fcc) was independent of polymer type
and concentration, as was the d-spacing and so the micelle hard-sphere radius. The maximum elastic
max) of 30 wt% F127 decreased from its value for water alone as PEG was added, but was little
changed by adding PVP. These results are consistent with the packed-micelles in the 30 wt% F127 gel
being effectively isolated from the polymer solution on the microscale while, especially for the PEG, being
mixed on the macroscale.
|Date Deposited:||03 Feb 2012 10:36|
|Last Modified:||25 Mar 2015 12:54|
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