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• W2100682736 endingPage "927" @default.
• W2100682736 startingPage "913" @default.
• W2100682736 abstract "Colloidal interactions between particles in a dispersion can be tuned by grafting polymeric chains onto the surface of the particles. The affinity between the polymeric chains and the continuous-phase liquid controls the strength of these interactions. In our system the polymer–liquid affinity is strongly influenced by temperature, and as a result, dramatic changes occur in the dispersion microstructure on heating. The system is an aqueous dispersion of polystyrene (PS) particles bearing grafted poly(ethylene oxide) (PEO) chains of low molecular weight (∼2000). At room temperature, water is a good solvent for PEO chains, and the dispersion is a stable, low-viscosity sol. As temperature is increased, water becomes a progressively worse solvent for PEO. Beyond a temperature Tc there is a sharp transition in microstructure from a stable sol to a volume-filling gel. The sol–gel transition is reversible and the transition temperature Tc can be pinpointed using tan δ versus temperature plots. Remarkably, Tc is more than 100 °C lower than the θ temperature for PEO (2000) in water, i.e., the gelation occurs under significantly better-than-θ conditions. Tc is independent of particle concentration, but is strongly influenced by the graft density of PEO chains on the particles. The higher the graft density, the higher the Tc for gelation; conversely, at very low graft density, the samples are gels even at room temperature. Above Tc, the elastic modulus (G′) of the gels reveals a power law dependence with particle volume fraction (φ), i.e., G′∝φn. The power law exponent n is independent of the PEO graft density, implying that the various gels have a similar microstructure. We suggest that gelation is the result of a weak secondary minimum in the interparticle potential that can develop in the case of short stabilizing moieties and moderate solvent conditions." @default.
• W2100682736 created "2016-06-24" @default.
• W2100682736 creator A5010400766 @default.
• W2100682736 creator A5059253837 @default.
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• W2100682736 date "2001-07-01" @default.
• W2100682736 modified "2023-10-05" @default.
• W2100682736 title "Thermoreversible gelation in aqueous dispersions of colloidal particles bearing grafted poly(ethylene oxide) chains" @default.
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• W2100682736 doi "https://doi.org/10.1122/1.1378030" @default.
• W2100682736 hasPublicationYear "2001" @default.
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