Liquid-crystalline polymers from cationic dendronized polymer-anionic lipid complexes.

The use of cationic dendronized polymers as a polyelectrolytic system for templating thermotropic liquid-crystalline phases (LC) via complexation and self-assembly with counter-charged ionic lipids is described. The topology of the LC phases resulting from the self-assembly process, their lattice parameter, and the interpenetration of lipid chains is discussed via birefringency analysis and small-angle X-ray scattering. Depending on the generation of the dendronized polymer and the length of the alkyl chains, amorphous, lamellar, and columnar tetragonal phases are observed. A structural model is proposed which accounts for the systematic variations of alkyl chain length as well as polymer generation. Owing to the reversible nature of the ionic complexation, this process proves high relevance for nanoporous channels, biomimetic, transport, and nanotemplating applications.