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, d...

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Bibliographic Details
Published in:Journal of polymer science. Part B, Polymer physics Polymer physics, 2016-01, Vol.54 (2), p.292-300
Main Authors: Bates, Christopher M., Chang, Alice B., Schulze, Morgan W., Momčilović, Nebojša, Jones, Simon C., Grubbs, Robert H.
Format: Article
Language:English
Subjects:
Block copolymers
block polymer
Blocking
brush polymer
Brushes
Conductivity
Dynamic structural analysis
Dynamics
Gels
ion gel
ionic liquid
Molecular weight
scattering
Volume fraction
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Summary: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 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.
ISSN:0887-6266
1099-0488
DOI:10.1002/polb.23927