Linear viscoelastic response and steady shear viscosity of native cellulose in 1-ethyl-3-methylimidazolium methylphosphonate

Rheology of Concentrated Polymer/Ionic Liquid Solutions: An Anomalous Plasticizing Effect and a Universality in Nonlinear Shear Rheology

“…η steady overlaps with the LVE envelopes well, confirming the validity of the Cox-Merz rule [80]. We note that in cellulose/IL solutions [86,87,88,89], the Cox-Merz rule was found to fail, where steady viscosity exhibits a weaker shear thinning behavior than complex viscosity. This unusual phenomenon was tentatively explained by the increased possibility of temporary intermolecular association when shear flow expands coils to improve their contacts [86].…”

“…We note that in cellulose/IL solutions [86,87,88,89], the Cox-Merz rule was found to fail, where steady viscosity exhibits a weaker shear thinning behavior than complex viscosity. This unusual phenomenon was tentatively explained by the increased possibility of temporary intermolecular association when shear flow expands coils to improve their contacts [86]. However, since both PEO and PMMA are polymers without mutual hydrogen bonding association, the Cox-Merz rule still works here.…”

“…In addition, neutral polymers used in this study do not have significant interactions with each other and solvents. However, strong hydrogen bond [86] and electrostatic [98] interaction were found to effectively change the concentration scaling of viscosity in IL solutions. The influence of these interactions on start-up rheology is to be clarified in future studies by using hydrogen-bond polymers and polyelectrolyte.…”

“…In future studies, stronger polymer-IL interaction is desired to be constructed to amplify their effect on nonlinear stress relaxation. To this end, polyelectrolytes/IL solutions, ionomer/IL solutions, and strong hydrogen-bonding pairs (e.g., cellulose/1-ethyl-3-methylimidazolium methylphosphonate [86]) are possible candidates. We hope that the present data will motivate more experimental and modeling/simulation works in this direction.…”

Rheological study of new dispersions of carbon nanotubes in the ionic liquid 1-ethyl-3-methylimidazolium dicyanamide

“…Their recently widespread applications in different technological fields are due to their unique characteristics such as low volatility, high thermal stability, high ionic conductivity and good solvation properties, among others [15,16]. One of their main advantages is that some properties can also be adjusted to particular requirements, such as solvents for organic reactions, tailored lubricants, high-performance liquid electrolytes or composite materials derived from polymers and nanomaterials [17,18]. ILs have attracted a growing interest in the fields of materials science and engineering, tribology and lubrication technologies [19][20][21][22][23].…”