Abstract
A series of crosslinked network polymerized ionic liquids (n-PILs) were synthesized with precise linker lengths, ranging from 4-12 carbons, to investigate the role of network nanostructure and electrostatic interactions on ion transport. The n-PILs contain tethered ammonium cations and either spherical BF4 or large, non-spherical bis(trifluoromethane)sulfonimide (TFSI) mobile anions. In the TFSI networks, a pronounced odd-even effect is observed with carbon linker length where the glass transition temperature (Tg) can vary by 45 K and conductivity by almost two orders of magnitude simply by adding one carbon between the junctions. The dynamic fragility of the temperature-dependent conductivity also shows an odd-even effect. In the BF4 networks, made from the same initial network, higher Tgs are observed with no odd-even effect. Both versions of the networks exhibit ionic aggregation peaks (via wide-angle X-ray scattering) which show monotonic variations with carbon length. These findings indicate that major odd-even Tg and conductivity effects can be observed with small variations in the chemical structure.
Original language | English (US) |
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Pages (from-to) | 332-341 |
Number of pages | 10 |
Journal | Molecular Systems Design and Engineering |
Volume | 4 |
Issue number | 2 |
DOIs | |
State | Published - Apr 2019 |
ASJC Scopus subject areas
- Chemistry (miscellaneous)
- Chemical Engineering (miscellaneous)
- Biomedical Engineering
- Energy Engineering and Power Technology
- Process Chemistry and Technology
- Industrial and Manufacturing Engineering
- Materials Chemistry