The Effect of Cation Structure on the Mesophase Architecture of Self-Assembled and Polymerized Imidazolium-Based Ionic Liquids
| Autor: | Dolly Batra, Millicent A. Firestone, Sönke Seifert |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Organic Chemistry Mesophase Condensed Matter Physics chemistry.chemical_compound Monomer chemistry Polymerization Lyotropic liquid crystal Ionic liquid Lyotropic Polymer chemistry Materials Chemistry Lamellar structure Physical and Theoretical Chemistry Alkyl |
| Zdroj: | Macromolecular Chemistry and Physics. 208:1416-1427 |
| ISSN: | 1521-3935 1022-1352 |
| DOI: | 10.1002/macp.200700174 |
| Popis: | The binary phase behavior of a series of imidazolium-based ionic liquids (ILs) has been investigated. In particular, the effect of two structural modifications of the imidazolium cation, alkyl chain length, and the introduction of a polymerizable acryloyl group at the alkyl chain terminus, has been studied using small angle X-ray scattering. Upon increasing water content, the non-polymerizable IL, 1-decyl-3-methylimidazolium chloride, adopts mesophase structures of predominately two-dimensional (2D) hexagonal symmetry, including structures intermediate in character between lamellae and 2D hexagonal micelles. Introduction of a photopolymerizable acryloyl functional group to form 1-(10-(acryloyloxy)decyl)-3-methyl-imidazolium chloride produces a rod-coil IL cation that yields self-assembled mesophases in which the formation of tetragonal morphologies is favored. Covalent linking of the IL cations by UV-induced polymerization converts the lyotropic mesophase into three-dimensional biocontinuous chemical gels. Reducing the alkyl chain length, as in the polymerizable IL cation 1-(8-(acryloyloxy)octyl)-3-methylimidazolium chloride, severely reduces the self-assembled mesophase order, and triggers the formation of only weakly ordered one-dimensional lamellar structures. |
| Databáze: | OpenAIRE |
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