N-Spirocyclic quaternary ammonium ionenes for anion-exchange membranes

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The development of cationic polymers for anion-exchange membranes (AEMs) with high alkaline stability and conductivity is a considerable challenge in materials chemistry. In response, we here present the synthesis and properties of N-spirocyclic quaternary ammonium ionenes (spiro-ionenes) containing 5- and 6-membered rings fused by central nitrogen cations. High-molecular weight and film-forming spiro-ionenes are successfully synthesized in cyclo-polycondensations of tetrakis(bromomethyl)benzene and dipiperidines under mild conditions. These polyelectrolytes show excellent thermal and alkaline stability with no degradation detected by NMR spectroscopy after more than 1800 h in 1 M KOD/D2O at 80 °C. Even at 120 °C, the spiro-ionenes display reasonable alkaline stability. Transparent and mechanically robust AEMs based on ionically crosslinked blends of spiro-ionene and polybenzimidazole reach OH conductivities up to 0.12 S cm-1 at 90 °C. The current findings demonstrate that spiro-ionenes constitute a new class of alkali-stable anion-exchange polymers and membranes.


Enheter & grupper

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Polymerkemi
  • Materialkemi
  • Polymerteknologi
Sidor (från-till)2888–2891
TidskriftJournal of the American Chemical Society
StatusPublished - 2017
Peer review utfördJa