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Biphasic epoxy-ionic liquid structural electrolytes: minimising feature size through cure cycle and multifunctional block-copolymer addition

Wendong, Quan; Dent, John; Arrighi, Valeria; Cavalcanti, Leide; Shaffer, Milo SP; Shirshova, Natasha

Biphasic epoxy-ionic liquid structural electrolytes: minimising feature size through cure cycle and multifunctional block-copolymer addition Thumbnail


Authors

Quan Wendong

John Dent

Valeria Arrighi

Leide Cavalcanti

Milo SP Shaffer



Abstract

Structural electrolytes provide mechanical properties approaching structural resin combined with a high degree of ionic conductivity. Here, structural electrolytes based on bisphenol A diglycidyl ether and the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EMIM-TFSI) were synthesised through reaction induced phase separation (RIPS) using isophorone diamine (iPDA) as a curing agent. The microstructure and properties of the resulting materials were controlled through both the initial formulations and the curing temperature. Curing at room temperature generated a bi-continuous structure and improved both mechanical performance and ionic conductivity of the resulting structural electrolytes. The balance between properties can be systematically adjusted; for example, a promising Young's modulus of 800 MPa was obtained simultaneously with an ionic conductivity of 0.28 mS cm−1, for a formulation containing 35 vol% EMIM-TFSI. The lengthscale of the structural features was reduced by an order of magnitude by introducing multifunctional block-copolymers (MF-bcP) based on glycidyl methacrylate (GMA) and quaternised (2-dimethylamino)ethyl methacrylate (DMAEMA). Small angle neutron scattering (SANS), obtained during curing, identified at least two structural phases of different length scale, for the formulations containing MF-bcP, in agreement with microstructures observed using scanning electron microscopy. Such structural electrolytes may be required when using structural electrodes that also have finer characteristic lengthscales. The addition of the MF-bcP to formulations containing 35 vol% EMIM-TFSI produced structural electrolytes with a Young's modulus of 530 MPa and an ionic conductivity of 0.64 mS cm−

Citation

Wendong, Q., Dent, J., Arrighi, V., Cavalcanti, L., Shaffer, M. S., & Shirshova, N. (2021). Biphasic epoxy-ionic liquid structural electrolytes: minimising feature size through cure cycle and multifunctional block-copolymer addition. Multifunctional materials, 4(3), Article 035003. https://doi.org/10.1088/2399-7532/ac1ea7

Journal Article Type Article
Acceptance Date Aug 18, 2021
Online Publication Date Sep 9, 2021
Publication Date 2021-09
Deposit Date Sep 22, 2021
Publicly Available Date Sep 22, 2021
Journal Multifunctional materials
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 4
Issue 3
Article Number 035003
DOI https://doi.org/10.1088/2399-7532/ac1ea7

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http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.







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