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Functional columnar liquid crystalline phases from ionic complexes of dendronized polymers and sulfate alkyl tails

  • Canilho, Nadia Department of Physics and Fribourg Center for Nanomaterials, Switzerland
  • Kasëmi, Edis Laboratory for Polymer Chemistry, Department of Materials, ETH-Zurich, Switzerland
  • Schlüter, Dieter A. Laboratory for Polymer Chemistry, Department of Materials, ETH-Zurich, Switzerland
  • Ruokolainen, Janne Helsinki University of Technology, Physics Laboratory, Finland
  • Mezzenga, Raffaele Department of Physics and Fribourg Center for Nanomaterials, Switzerland - Nestlé Research Center, Lausanne, Switzerland
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    02.09.2008
Published in:
  • Macromolecular Symposia. - 2008, vol. 270, no. 1, p. 58 - 64
dendronized polymers
lipids
liquid crystals
self-assembly
supramolecular complexation
English We describe how cationic dendronized polymers of generations 1, and 2 and anionic monoalkyl tails can be combined by supramolecular ionic complexation into comb-like liquid crystalline polymers. The final structures in bulk of these supramolecular complexes were studied by differential scanning calorimetry (DSC), cross-polarized optical microscopy (CPOM), small angle x-rays scattering (SAXS) and transmission electron microscopy (TEM). The combination of these techniques allowed elucidating (i) that these complexes exhibit thermotropic behaviour, (ii) that various liquid crystalline structures in the 3-5 nm length scale can be obtained such as columnar rectangular, columnar tetragonal, columnar hexagonal and lamellar, depending both on alkyl tail length and polymer generation, (iii) that although the alkyl tails represent the majority phase in the columnar phases, they form the cylindric domains, and the dendronized polymers occupy the continuous domains. Therefore, upon selective cleavage of the alkyl tails in the columnar phases, the present self-assembly approach may constitute an efficient strategy towards the formation of porous organic matrices with ultra-dense pore size in the range of 2 to 4 nm.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/300980
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