Linear rheological properties of low molecular weight polyethylene glycol solutions

This experimental study of the linear viscoelastic properties of PEG600 aqueous solutions at various concentrations and temperatures mainly aims at getting a better understanding, in concentrated regimes, of the role played on the structural and rheological properties by PEG assembly properties previously evidenced in the dilute regime. The results indicate a peculiar and unique viscoelastic behavior: the elastic modulus versus frequency curves are nearly the same for all concentrations and temperatures investigated. The key role played by hydrogen bonds in the rheological properties of PEG solutions is highlighted. The relaxation on long time scales is indicative of large scale complex associative polymeric structures. A schematic complete phase diagram of PEG600 in water is finally proposed.

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► The linear rheology of PEG600 aqueous solutions was studied.
► Hydrogen bonds govern the structure and rheology.
► A unique linear viscoelastic behavior was evidenced.
► The rheological behavior is due to the dynamics of large associative PEG aggregates.