Mechanical, Dielectric and Structural Characterization of Cross-Linked PEG-Diacrylate/Ethylammonium Nitrate Ionogels

Published

March 22, 2016

Author(s)

Carlos Lopez-Barron, Peter J. Beltramo, Yun Liu, Sung-Min Choi, Min-Jae Lee

Abstract

We report the preparation and characterization of cross-linked ionogels (x-IGs) composed of polyethylene glycol diacrylate (PEGDA) and the protic ionic liquid, ethylammonium nitrate (EAN). The cross-linking process has a huge effect on the mechanical properties of the solutions (forming stiff solids from Newtonian solutions) and a minimum penalty on the ionic conductivity. The interdependence of the mechanical and dielectric properties with the network structure of the x-IGs was studied using three experimental probes: torsion and compression mechanical testing, dielectric spectroscopy and small angle neutron scattering. Microstructure, mechanical strength and conductivity depend strongly on the polymer concentration and weakly on the temperature. High modulus and relatively low conductivities are associated to small cross-link junction length, ξ, observed in concentrated samples, whereas large ξ values, observed in dilute samples, result in high conductivities and relatively low modulus. The topological restriction to ionic transport (i.e., to conductivity) is quantified by the obstruction factor, which increases monotonically with ξ, while the shear modulus exhibits a power law behavior, G ξ^-3, in accordance to linear viscoelastic theory.

Citation

Polymer

Volume

87

Pub Type

Journals

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Keywords

Small Angle Neutron Scattering, Ionogels

Citation

Lopez-Barron, C. , Beltramo, P. , Liu, Y. , Choi, S. and Lee, M. (2016), Mechanical, Dielectric and Structural Characterization of Cross-Linked PEG-Diacrylate/Ethylammonium Nitrate Ionogels, Polymer, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=911653 (Accessed April 18, 2024)