Room-Temperature, Aqueous-Phase Fabrication of Poly(methacrylic acid) Brushes by UV-LED-Induced, Controlled Radical Polymerization with High Selectivity for Surface-Bound Species
| Autor: | Seunghwan Lee, Robert M. Bielecki, Nicholas D. Spencer, Raphael Heeb |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Poly(methacrylic acid) Aqueous solution Materials science Polymers and Plastics Organic Chemistry Radical polymerization Polymer Quartz crystal microbalance medicine.disease_cause Inorganic Chemistry Contact angle chemistry.chemical_compound chemistry Methacrylic acid Chemical engineering Polymer chemistry Materials Chemistry medicine Ultraviolet |
| Zdroj: | Macromolecules. 42:9124-9132 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | Poly(methacrylic acid) (PMAA) brushes were grafted from Si/SiO2 substrates by means of immobilized-photoiniferter-mediated controlled radical polymerization. The employed UV setup was based on ultraviolet light-emitting diodes (UV-LEDs), which allowed for a precise control of the brush height with irradiation time, as observed by in situ quartz crystal microbalance experiments with dissipation monitoring (QCM-D). In contrast to many alternative approaches, it was shown that the novel UV source in combination with a photoiniferter renders lengthy postcleaning steps of the synthesized brushes unnecessary. Following characterization of the polymer layers by means of variable-angle spectroscopic ellipsometry (VASE) and static contact angle measurements, the lubrication properties of the PMAA brushes were investigated in macroscopic tribological experiments under low-contact-pressure, aqueous conditions. Results indicated that PMAA brushes have the potential to dramatically reduce sliding friction in an aqueou... |
| Databáze: | OpenAIRE |
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