Poly(p-phenylene)s tethered with oligo(ethylene oxide): synthesis by Yamamoto polymerization and properties as solid polymer electrolytes

摘要: Salt-containing supramolecular assemblies of rigid-rod polymers tethered with flexible ion-solvating side chains represent a synthetic pathway towards thin ion-conducting solid electrolyte membranes high dimensional stability. In the present work we have synthesized poly(p-phenylene)s (PpPs) carrying di-, tri- and tetra(ethylene oxide) chains, respectively. p-Dichlorophenyl oligo(ethylene monomers were polymerized by Ni-mediated Yamamoto polymerization via in situ reduction Ni(II). This gave PpPs an average degree reaching 60, where each phenylene ring carried one chain. Results from calorimetry X-ray scattering measurements clearly showed formation molecular composites, i.e., bicontinuous morphologies mechanically reinforcing layers stiff PpP backbones separated chains. morphology was retained after adding lithium bis(trifluoromethane)sulfonimide (LiTFSI) to form salt-in-polymer electrolytes, but increased distance between adjacent backbones. Furthermore, upon addition salt order-to-disorder transition (ODT) region ∼50–170 °C ∼75–200 at [EO]/[Li] = 20. Increasing concentrations also revealed maximum ODT enthalpy 40. At 80 160 °C, ionic conductivity reached 1.1 × 10−4 1.0 10−3 S cm−1, Finally, demonstrate that polymer electrolytes can be significantly additions triglyme.