Structural Characterization of Self-Organized Mono- and Multilayers of Poly[bis(2,2,3,3-tetrafluoropropoxy)phosphazene] at the Air/Water Interface
The layering transitions of mesomorphic poly[bis(2,2,3,3-tetrafluoropropoxy)phosphazene] induced by compression were found to result in the formation of stable multilayers directly at the air/water interface. This phenomenon is discussed with particular emphasis on its in situ structural characte...
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Veröffentlicht in: | Macromolecules 2015-05, Vol.48 (10), p.3327-3336 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The layering transitions of mesomorphic poly[bis(2,2,3,3-tetrafluoropropoxy)phosphazene] induced by compression were found to result in the formation of stable multilayers directly at the air/water interface. This phenomenon is discussed with particular emphasis on its in situ structural characterization by Brewster angle microscopy, infrared spectroscopy, synchrotron grazing incidence X-ray diffraction, and X-ray reflectivity data. Compression of Langmuir monolayer is followed by layer-by-layer growth manifested by pronounced steps in the pressure/area isotherm. Grazing incidence X-ray diffraction reveals only one diffraction peak for the monolayer as well as for multilayers, which corresponds to an interchain spacing d = 12.3 Å. The in-plane correlation length ξ xy reaches an impressive 345 Å for the uncompressed monolayer and 470 Å for the tetralayer, implying a certain mesoscale order similar to a quasi-long-range one. After formation of the four-layer thick film the transition into a 3D crystalline triclinic phase with a = 13.19 Å, b = 11.42 Å, c = 4.83 Å, α = 90°, β = 102°, and γ = 116° is observed. |
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ISSN: | 0024-9297 1520-5835 |
DOI: | 10.1021/acs.macromol.5b00270 |