posted on 2019-05-22, 00:00authored byPier-Luc Champagne, David Ester, Danielle Polan, Vance E. Williams, Venkataraman Thangadurai, Chang-Chun Ling
Novel cyclodextrin (CD)-based amphiphilic
poly(carboxylic acid)s
that self-assemble into highly ordered smectic liquid crystalline
mesophases were investigated as a novel class of protonic conductors.
These structurally well-defined materials are synthesized from nontoxic
and environment-friendly CDs, which possess a unique face-to-face
pseudosymmetry. By taking advantage of such geometry, a series of
flexible tetraethylene glycol groups terminated with a carboxylic
acid functionality were introduced to the CD’s secondary face,
resulting in the formation of long-range 2D hydrogen-bond networks
in the smectic mesophases over a wide temperature window. This new
material was found to exhibit impressive proton conductivities in
solid states, up to 1.4 × 10–2 S cm–1 at 70 °C and 95% humidity. This constitutes the first report
of amphiphilic CD-based liquid crystals applied as proton conductive
materials.