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Effect of water-soluble polymers, polyethylene glycol and poly(vinylpyrrolidone), on the gelation of aqueous micellar solutions of pluronic copolymer F127.
journal contribution
posted on 2023-06-09, 12:51 authored by Nágila M P S Ricardo, Nadja M P S Ricardo, Flávia de M L L Costa, Francisco W A Bezerra, Chiraphon Chaibundit, Daniel Hermida-Merino, Barnaby GreenlandBarnaby Greenland, Stefano Burattini, Ian W Hamley, S Keith Nixon, Stephen G YeatesThe 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 con- centration 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 modulus (G0max) 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.
History
Publication status
- Published
Journal
Journal of Colloid and Interface ScienceISSN
0021-9797Publisher
ElsevierExternal DOI
Issue
1Volume
368Page range
336-341Department affiliated with
- Chemistry Publications
Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2018-04-12First Compliant Deposit (FCD) Date
2018-04-12Usage metrics
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