When tethered chains meet free ones: the stability of polymer wetting films on polymer brushes
| Autor: | Joost H. Maas, Frans A. M. Leermakers, G.J. Fleer, Martinus Abraham Cohen Stuart |
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| Jazyk: | angličtina |
| Rok vydání: | 2003 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Chemistry Laboratorium voor Fysische chemie en Kolloïdkunde Organic Chemistry Disjoining pressure Polymer Degree of polymerization Condensed Matter Physics Polymer brush pattern-formation Contact angle chemistry.chemical_compound Chemical physics Polymer chemistry thin liquid-films Materials Chemistry Polystyrene Wetting Thin film Physical Chemistry and Colloid Science |
| Zdroj: | Macromolecular Symposia 191 (2003) 1 Macromolecular Symposia, 191(1), 69-79 |
| ISSN: | 1022-1360 |
| DOI: | 10.1002/masy.200390015 |
| Popis: | We present a combined experimental and theoretical self-consistent field (SCF) investigation of the wetting behavior of a polystyrene melt (composed of chains with degree of polymerization P) on top of a polystyrene brush (composed of chains with length N) grafted onto a silica surface. The control variables are the grafting density a of the brush chains and the length of mobile chains P. Experiments show in agreement with the theory that there is a window of complete wetting. Both at very low and at high grafting densities the system remains partial wet. At large degree of polymerization P, there is a difference between the experimental and theoretical results. Theory predicts partial wetting only, whereas the window of complete wetting persists in the experiments even when P >> N. This difference is attributed to the double-well structure of the disjoining pressure as revealed by the SCF theory. With this type of disjoining pressure it is conceivable that a metastable zero contact angle remains present for very long times. |
| Databáze: | OpenAIRE |
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