Comicellization of Binary PEO–PPO–PEO Triblock Copolymer Mixtures in Ethylammonium Nitrate
2018
Xie, Ru | López-Barrón, Carlos R. | Greene, Daniel G. | Wagner, Norman J.
The micellization of dilute solutions of Pluronic block copolymers P123 (EO₂₀–PO₇₀–EO₂₀) and F127 (EO₁₀₆–PO₇₀–EO₁₀₆) and comicellization of binary mixtures in partially deuterated ethylammonium nitrate (d₃EAN, a protic ionic liquid) are studied by small-angle neutron scattering. The average Pluronics composition in micelles shows a linear dependence on the bulk Pluronic composition. The mole ratio between P123 molecules in the micelles to those existing as unimers in solvent increases with temperature and P123 concentration. At a fixed F127/P123 ratio, the micelle core radius, the micelle corona thickness, and the aggregation number decrease with increasing temperature, while the total micelle volume fraction increases. At a fixed temperature, increasing P123 content in the binary mixtures leads to a weak minimum in micelle core size and aggregation number and a weak maximum in micelle corona thickness and total volume fraction of micelles. The comicellization behavior in d₃EAN resembles that in aqueous solutions reported experimentally and theoretically. To our knowledge, this is the first experimental report on comicellization behavior of Pluronic triblock copolymers in a protic ionic liquid.
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