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Structure and thermorheology of copolymer-clay particles mixtures
MSC : Imane Boucenna, Pierre Colinart, Marie-Alice Guedeau-Boudeville, Ahmed Mourchid, Laurent Royon.
This subject concerns the study of the temperature-dependant properties of concentrated copolymer-clay solutions. Water-soluble triblock copolymers have thermotropic rheological behavior. The increase of concentration or temperature of the copolymer solutions yield ordered cubic lattice structures with formation of stiff gels at either relatively high concentration or temperature. Addition of clay particles to the copolymer ordered gel phase promotes the reverse phase transition from crystal to fluid, as it is shown from SANS data. The rheology technique is sensitive to this order-disorder promoted by the clay particles since the consequences on SANS data are associated with a decrease in the viscous and elastic moduli and a shift in the gelation temperature of the copolymer micelles to high temperature values. We interpret the data as being a consequence of the adsorption of unimers on the clay particles, which in turn decreases the density of micelles in solution and induces the reverse phase transition from order to disorder.
Imane Boucenna, Laurent Royon, Pierre Colinart, “Effect of laponite clay particles on thermal and rheological properties of pluronic triblock copolymer” J Therm Anal Calorim 98 119–123 (2009)
Imane Boucenna, Laurent Royon, Pierre Colinart, Marie-Alice Guedeau-Boudeville, Ahmed Mourchid, ”Structure and Thermorheology of Concentrated Pluronic Copolymer Micelles in the Presence of Laponite Particles”, Langmuir, in press (2010)
Nom des membres actuels ou anciens
BOUCENNA Imane, COLINART Pierre, GUEDEAU-BOUDEVILLE Marie-Alice, MOURCHID Ahmed, ROYON Laurent
General keyword
Teams
Keywords
- Flow of Complex Fluids
- Surfactants, membranes, self-assembling
- Polymers, supramolecular polymers, polyelectrolytes, cytoskeleton
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