Conformational Changes of a Surface-Tethered Polymer during Radical Growth Probed with Second-Harmonic Generation
| Autor: | Christ Glorieux, Monique A. van der Veen, Maarten Bloemen, Thierry Verbiest, Guy Koeckelberghs, Steven Deckers |
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| Rok vydání: | 2017 |
| Předmět: |
Surface (mathematics)
02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound Nonlinear optical Electrochemistry General Materials Science Spectroscopy chemistry.chemical_classification Quantitative Biology::Biomolecules Atomic force microscopy Second-harmonic generation Surfaces and Interfaces Polymer 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Condensed Matter::Soft Condensed Matter Crystallography Monomer Tilt (optics) chemistry Polymerization sense organs 0210 nano-technology |
| Zdroj: | Langmuir. 33:4157-4163 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/acs.langmuir.7b00172 |
| Popis: | The surface-induced polymerization of a chromophore-functionalized monomer was probed in situ for the first time using a nonlinear optical technique, second-harmonic generation. During the first hours of the polymerization reaction, dramatic changes in the tilt angle of the chromophore-functionalized side groups were observed. Following evaluation of the nonlinear optical data with those obtained from atomic force microscopy and ultraviolet-visible, we conclude that second-harmonic generation efficiently probes the polymerization reaction and the conformational changes of the surface-grafted polymer. With polymerization time, the conformation of the surface-tethered polymer changes from a conformation with the polymer backbone and its side groups flat on the surface, i.e., a "pancake" conformation, to a conformation where the polymer backbone is stretched away combined with tilted side groups or an enlarged tilt angle distribution, i.e., a "brush-type" conformation. |
| Databáze: | OpenAIRE |
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