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Luigi Gentile, Giuseppina De Luca, Filipe E. Antunes, Cesare Oliviero Rossi, Giuseppe Antonio Ranieri
Thermogelation Analysis Of F127-Water Mixtures By Physical Chemistry Techniques
Appl. Rheol. 20:5 (2010) 52081 (9 pages)
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Aqueous solutions of F127 pluronic systems exhibit an interesting thermal gelation above a certain concentration. This phenomenon
concerns the transition from a liquid-like behavior at low temperatures to a solid-like behavior at high temperatures,
and it is due to different temperature responses from the different polymer segments, polypropylene oxide (PPO) and
polyethylene oxide (PEO). Such property leads to a structural change in the self assembled macromolecule upon heating,
from an isotropic micellar structure to an ordered cubic structure. These two types of assembly are clearly distinct with
respect to their rheological behavior.This contribution emphasizes the rheological properties of the pluronic system in micellar
and cubic phase, in combination with NMR, Dynamic Light Scattering and DSC information. The results emphasize the
gelation process upon heating and a cubic phase characterized by higher storage modulus and higher A and z Weak Gel
Model exponents than the micellar phase. Micellar growth upon heating was found within micellar phase. The presented
data support the hypothesis that each polymer segment actively participates in the formation of the different phases: while
PPO is responsible for micelle formation, PEO plays a dominating role in cubic phase formation. Finally, different stiffness
between the core and the corona of the aggregates in the two phases is observed.
► Cite this publication as follows:
Gentile L, DeLuca G, Antunes FE, OlivieroRossi C, Ranieri GA: Thermogelation Analysis Of F127-Water Mixtures By Physical Chemistry Techniques, Appl. Rheol. 20 (2010) 52081.
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