Brush polymer ion gels. Issue 2 (7th October 2015)

• Record Type: Journal Article
• Authors: Bates, Christopher M.; Chang, Alice B.; Schulze, Morgan W.; Momčilović, Nebojša; Jones, Simon C.; Grubbs, Robert H.
• Is Part Of: Journal of polymer science. Volume 54:Issue 2(2016)
• Page Start: 292
• Page End: 300
• Publication Date: 2015-10-07
• Subjects: block polymer -- brush polymer -- ion gel -- ionic liquid -- scattering; 547
• DOI: 10.1002/polb.23927
• Languages: English
• ISSNs: 0887-6266

Abstract

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 % ( 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 . © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 292–300 Abstract : Ion gels comprising ABA brush block copolymers and 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMI][TFSI]) are reported. Structure and conductivity measurements reveal trends in gel properties as a function of block volume fraction, polymer molar mass, and concentration. Conductivities near 1 mS/cm at 25 °C and normalized conductivities 0.2 to 0.8 highlight liquid‐like dynamics in the matrix phase and potentially presage future applications.