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The structure, rheological response, and ionic conductivity of ABA brush block copolymer (BBCP) ion gels containing 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMI][TFSI]) at polymer concentrations spanning 5‐50 wt % (Φgel) were studied by small angle X‐ray scattering, dynamic mechanical analysis, and AC impedance spectroscopy. Application of a hard sphere form factor and Percus‐Yevick structure factor reveals trends in gel micellar structure as a function of BBCP molecular weight, A block volume fraction (ΦA), and Φgel. Viscoelastic properties are strongly dependent on end‐block molar mass, with storage moduli ≤103 Pa at 25 °C. Impedance measurements reveal near liquid‐like dynamics in the matrix phase as evidenced by conductivities near 1 mS/cm at 25 °C that decrease with increasing Φgel and ΦA.
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Bates et al. (2015) studied this question.
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