Abstract
Polysiloxane phosphonium single-ion conductors grafted with oligomeric PEO and with ion contents ranging from 5 to 22 mol % were synthesized via hydrosilylation reaction. The parent Br- anion was exchanged to F- or bis(trifluoromethanesulfonyl)imide (TFSI-). X-ray scattering data suggest ion aggregation is absent in these phosphonium ionomers, which contributes to low glass transition temperatures (below -70 °C) with only a weak dependence on both ion content and counteranion type. Conductivities weakly increase with ion content but exhibit a strong dependence on anion type. The highest conductivity at 30 °C is 20 μS/cm for dry neat ionomer, with the TFSI- anion, consistent with its relatively delocalized negative charge and large size that weaken interactions between TFSI- and the phosphonium cation.
Original language | English (US) |
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Pages (from-to) | 4428-4437 |
Number of pages | 10 |
Journal | Macromolecules |
Volume | 47 |
Issue number | 13 |
DOIs | |
State | Published - Jul 8 2014 |
All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry