Robust, Solvent-Free, Catalyst-Free Click Chemistry for the Generation of Highly Stable Densely Grafted Poly(ethylene glycol) Polymer Brushes by the Grafting To Method and Their Properties
| Autor: | Nataraja Sekhar Yadavalli, Sergiy Minko, Christopher D. McNitt, Vladimir V. Popik, Amine M. Laradji |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Glycidyl methacrylate Materials science Polymers and Plastics Organic Chemistry technology industry and agriculture 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Grafting 01 natural sciences Cycloaddition 0104 chemical sciences Catalysis Inorganic Chemistry chemistry.chemical_compound chemistry Polymer chemistry PEG ratio Materials Chemistry Click chemistry 0210 nano-technology Ethylene glycol |
| Zdroj: | Macromolecules. 49:7625-7631 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.6b01573 |
| Popis: | Herein we report a robust, highly selective, and efficient method to prepare dense poly(ethylene glycol) (PEG) polymer brushes on silicon substrates via solvent-free, catalyst-free, strain-promoted acetylene–azide cycloaddition (SPAAC) reaction. First, poly(glycidyl methacrylate) was grafted to the silicon substrate as an anchoring layer to immobilize cyclopropenone-caged dibenzocyclooctyne-amine (photo-DIBO-amine) via an epoxy ring-opening reaction providing protected, stable, and functionalized substrates. Next, three synthesized α-methoxy-ω-azido-PEGs of different molecular weights (5, 10, and 20 kg/mol) were successfully grafted to the photo-DIBO-modified silicon substrates from melt after the deprotection of DIBO with UV-irradiation. PEG molecular weight, reaction temperature, and reaction time were all used to control the grafting reaction for targeted brush thicknesses and grafting densities. The highest grafting density obtained was close to 1.2 chains/nm2 and was achieved for 5 kg/mol PEG. The pr... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|