Motional Heterogeneity of Intercalated Species in Modified Clays and Poly(ε-caprolactone)/Clay Nanocomposites
| Autor: | Laetitia Urbanczyk, Jana Hrobarikova, Robert Jérôme, Jean Grandjean, Cédric Calberg |
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| Rok vydání: | 2006 |
| Předmět: |
inorganic chemicals
chemistry.chemical_classification Nanocomposite Magic angle Chemistry Intercalation (chemistry) Relaxation (NMR) technology industry and agriculture Surfaces and Interfaces Polymer Condensed Matter Physics complex mixtures Molecular dynamics chemistry.chemical_compound Nuclear magnetic resonance Chemical engineering X-ray crystallography Electrochemistry General Materials Science Caprolactone Spectroscopy |
| Zdroj: | Langmuir. 22:4818-4824 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la060041u |
| Popis: | Modified laponites and synthetic saponites are used as precursors for the preparation of poly(epsilon-caprolactone) (PCL)/clay nanocomposites. The structure and dynamics of species intercalated in the modified clays and the corresponding nanocomposites are characterized by X-ray diffraction and magic-angle spinning NMR. The influence of the headgroup, the hydrocarbon chain length, and the loading of the surfactant on the nanocomposite formation are discussed. The yield of PCL intercalation is related to the probability of direct polymer-clay interactions and to the size of the clay platelets. Relaxation times in the laboratory and rotating frames that allow characterization of fast and slow molecular dynamics in these systems are discussed, showing a motional heterogeneity of the intercalated species. |
| Databáze: | OpenAIRE |
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