ArticleMacromolecules2026
From Solvent-Mediated Micellization to Packing in a Face-Centered Cubic Structure of Poloxamers.
Article in Macromolecules, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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4 authors.
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Abstract
Ethylammonium nitrate (EAN) is one of the most studied protic ionic liquids (ILs) offering unique properties for self-assembly of poloxamers. Understanding how solvent composition in EAN-water mixtures governs block copolymer self-assembly has yet to be investigated in full detail. This study systematically investigates the temperature-driven self-assembly of Poloxamer 407 in the full composition range of EAN-water mixtures, combining small-angle X-ray scattering (SAXS), rheology, and differential scanning calorimetry (DSC) to resolve micellization and lyotropic liquid crystal (LLC) formation, also termed gelation in the literature. This work reveals a distinct nonmonotonic dependence of both micellization and LLC transitions on EAN content in the solvent, where a minimum at 60:40 wt % EAN:water ratio is observed. We identify a universal trend in the evolution of micelle volume fraction against normalized temperature independent of solvent nature and surfactant concentration. Extrapolation of this sigmoidal trend shows a critical micelle volume fraction of approximately 0.49 required for face-centered cubic (FCC) ordering, which remains invariant across all solvent environments and agrees with the entropic bonding theory of colloidal crystallization. Moreover, we resolve two temperature-dependent micellization regimes in the transition region, characterized by a decrease in micellar number density at early stages, followed by micellization and micelle growth through unimer incorporation, resulting in an increase in number density.
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