The effects of heating rate and shear stress on the sol-gel transition for a polyacrylamide gel during in situ preparation were investigated by dynamic rheology. The gelation evolution was also studied through monitoring of the static gelation process by means of temperature, pH, and conductivity variation. The gels were prepared by polymerization of acrylamide crosslinked with N,N′-methylenebisacrylamide using a redox initiation based on potassium

Rheological properties and zeta potential were investigated for 1% Laponite RD aqueous dispersions with different contents of poly(ethylene glycol). At low concentrations of polymer (< 1 %) the clay dispersions are stable whereas an unstable liquid phase appears above 2 % polymer. The samples present a Newtonian behavior, showing more viscous than elastic response. The viscoelastic moduli are influenced by the polymer content and temperature. The

Vapor pressure data (at 50°C) of solutions of poly(methyl methacrylate) [PMMA], poly-styrene [PS] and of poly(styrene-ran-methyl methacrylate [P(S-ran-MMA)], with differ-ent weight fractions f of styrene units, in either CHCl3, acetone [AC], methyl acetate [MeAc] or toluene [TL] were evaluated with respect to the dependence of the Flory-Huggins interaction parameter on polymer concentration and on f. For all solutions under investigation, the Flory-Huggins