Novel amphiphilic single-ion conductive polynorbornenes with pendent cyclotriphosphazenes have been studied as candidates for lithium-ion conductive membranes for lithium-seawater batteries. The cyclotriphosphazene components were linked to a 5-norbornene-2-methoxy substituent to provide a polymerizable unit. 2-(2-Phenoxyethoxy)ethoxy cosubstituents on the cyclotriphosphazene unit of the first comonomer were utilized to simultaneously facilitate lithium cation transport and introduce hydrophobicity into the polymer electrolyte. 4-(Lithiumcarboxalato)phenoxy side groups were linked to the rings of a second comonomer to provide tethered anions with mobile lithium cations and to increase the dimensional stability of the final polymers. The synthesis of norbornenemethoxy-based cyclotri-phosphazene monomers, their ring-opening metathesis polymerization, deprotection and lithiation of the 4-(propylcarboxalato)phenoxy side groups, and the characterization of the polymers are discussed to illustrate the dependence of ion transport and hydrophobic properties on the polymer composition.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Chemistry