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Mesophase structure of low‐wetting liquid crystalline polyacrylates with new perfluoroalkyl benzoate side groups

Martinelli, Elisa ; Paoli, Francesca ; Gallot, Bernard ; Galli, Giancarlo

Journal of Polymer Science Part A: Polymer Chemistry, 15 September 2010, Vol.48(18), pp.4128-4139 [Rivista Peer Reviewed]

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  • Titolo:
    Mesophase structure of low‐wetting liquid crystalline polyacrylates with new perfluoroalkyl benzoate side groups
  • Autore: Martinelli, Elisa ; Paoli, Francesca ; Gallot, Bernard ; Galli, Giancarlo
  • Note di contenuto: The synthesis, thermal behavior, bulk microstructure, and wettability of new polyacrylates carrying spaced 4‐perfluorohexylpropyl benzoate and 4‐perfluorooctylpropyl benzoate units in the side groups were investigated. X‐ray diffraction analysis proved the formation of different smectic mesophases (SmI, SmF, and SmC) and the evolution of their structures and lattice parameters with temperature. The mesophase polymorphic behavior depended on the length of the perfluorinated chain segment in the repeat unit. The electron density profiles along the smectic layer normal were drawn and provided a deeper insight into the packing of the side chains in a tilted, double layer structure. Thin polymer films were cast from solution, and their low wettability was established by measurements of contact angles with different probing liquids. We suggest that the hydrophobicity and lipophobicity of the films are enhanced by the mesophase surface structure which is mediated by the high‐order, mesophase bulk structure. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 4128–4139, 2010 New polyacrylates carrying spaced 4‐perfluoroalkylpropyl benzoate units in the side groups were synthesized, and their thermal behavior, bulk microstructure, and wettability were investigated. X‐ray diffraction analysis proved the formation of different smectic mesophases (SmI, SmF, and SmC), with a polymorphic behavior dependent on the length of the perfluorinated chain segment. The electron density profiles along the smectic layer normal pointed to a packing of the side chains in a tilted, double layer structure. Thin polymer films exhibited low wettability. We suggest that the hydrophobicity and lipophobicity of the films are enhanced by a mesophase surface structure.
  • Fa parte di: Journal of Polymer Science Part A: Polymer Chemistry, 15 September 2010, Vol.48(18), pp.4128-4139
  • Soggetti: Fluoropolymers ; Liquid‐Crystalline Polymers ; Mesophase Structure ; Surface Energy ; Thin Films ; Wettability
  • Lingua: Inglese
  • Tipo: Articolo
  • Identificativo: ISSN: 0887-624X ; E-ISSN: 1099-0518 ; DOI: 10.1002/pola.24207

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