Structural investigations on low-temperature-polymerized monolayers of a diacetylenic Bronco lipid
| Autor: | I.R. Peterson, R. Steitz, I. Voigt-Martin, Helmuth Möhwald |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
chemistry.chemical_classification
Quantitative Biology::Biomolecules Metals and Alloys Surfaces and Interfaces Polymer Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Crystallography Monomer chemistry Polymerization Electron diffraction Monolayer Materials Chemistry Molar mass distribution Organic chemistry Molecule Chirality (chemistry) |
| Zdroj: | Thin Solid Films. 178:289-304 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/0040-6090(89)90314-3 |
| Popis: | Monolayers of a diacetylenic Bronco molecule, a symmetrical diester derivative of 13,8-diacetylene carboxylic acid with a quaternary ammonium bridgehead, were polymerized at 12°C on the water surface and then transferred to substrates. The polymer was found to exist mainly in two chiral enantiomeric crystalline forms. The chirality originates in the packing of the monomer molecules prior to polymerization, and microscopic inclusions of twinned enantiomer give rise in some cases to streaking or splitting of the transmission electron diffraction (TED) spots. The bridgehead groups cross-link the polymer chains into a solid two-dimensional network. When the substrate was not perpendicular to the electron beam, the TED pattern contained evidence of inhomogeneous and non-zero average side-chain tilt. On heating, the lattice expanded anisotropically and, above 200°C, irreversibly. The thermodesorption behaviour indicated a bimodal molecular weight distribution. |
| Databáze: | OpenAIRE |
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