Dual conductivity of ionic polyacetylene by the metathesis cyclopolymerization of dendronized triazolium-functionalized 1,6-heptadiyne

Ionic polyacetylenes (iPAs) with the trans configuration and a five-membered ring structure were synthesized by the metathesis cyclopolymerization of dendronized triazolium-functionalized 1,6-heptadiyne. The iPAs bearing flexible pendants had a low glass transition temperature of −37 °C, a high decomposition temperature of 349 °C, and a relatively high intrinsic ionic conductivity of 7.3 × 10⁻⁵ S·cm⁻¹ at room temperature, which further increased to 1.4 × 10⁻⁴ S·cm⁻¹ by doping with lithium bis(trifluoromethanesulfonyl)imide. Moreover, the iodine-doped iPAs exhibited dual conductivity, i.e., ionic and electronic conductivities of 7.1 × 10⁻⁵ and 5.0 × 10⁻⁵ S·cm⁻¹, respectively. Therefore, the conjugated iPAs with a good film-forming property provide a potential for making dual-conductive flexible electronics.