Brush polymer ion gels
Abstract
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. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 292–300
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 07, 2015
- Source ID
- 10.1002/polb.23927
Entities
People
- Alice B Chang
- Christopher M Bates
- Morgan W Schulze
- Nebojša Momčilović
- Robert H. Grubbs
- Simon C Jones
Organizations
- California Institute of Technology
- United States Department of Defense
- University of Minnesota