A series of imidazolium-based bis(trifluoromethylsulfonyl)imide [NTf2] ionene networks were prepared by using thiol-yne ‘click’ photopolymerization to crosslink bisalkynylimidazolium [NTf2] monomers with pentaerythritol tetrakis(3-mercaptopropionate) (PTMP). The thiol:yne molar ratio was varied in order to examine changes in the thermal, mechanical and conductive properties of the resulting polymer networks. Photorheology was utilized to determine the approximate gel points for each of the polymer networks prepared. Both crosslink density, determined from dynamic mechanical analyses, and ionic liquid (IL) concentration were factors in changing the ionic conductivity of the networks. Overall, the polymer that combined a relatively low crosslink density with high IL concentration exhibited the highest conductivity (~10-6 S/cm at 20 °C).

Imidazolium-containing thiol-yne ionene networks: thermal, mechanical and conductive properties

ACS Spring Meeting 2021

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