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Published January 15, 2016 | public
Journal Article

Brush polymer ion gels


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 % (Φ_(gel)) 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 (Φ_A), and Φ_(gel). Viscoelastic properties are strongly dependent on end-block molar mass, with storage moduli ≤10^3 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 Φ_(gel) and Φ_A.

Additional Information

© 2015 Wiley Periodicals, Inc. Received 15 July 2015; accepted 10 September 2015; First published: 7 October 2015. We thank Prof. Julia Kornfield for rheometer access. C.M.B. thanks the Dreyfus Foundation for Environmental Postdoc Fellowship EP-13-142. A.B.C. thanks the U.S. Department of Defense for support through the NDSEG fellowship. M.W.S. thanks Prof. Marc A. Hillmyer for support. Portions of this work were performed at the Advanced Photon Source Sector 12 Beamline. Use of the Advanced Photon Source was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.

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