Controlled-release polymers for delivery of dipyridyls and tetraalkyl ammonium hydroxide
| Autor: | Nathan A. Carrington, D. Lynn Rodman, Kisholoy Goswami, Zi-Ling Xue |
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| Rok vydání: | 2007 |
| Předmět: |
chemistry.chemical_classification
Vinyl alcohol integumentary system Polymers and Plastics Kinetics General Chemistry Polymer Controlled release Surfaces Coatings and Films chemistry.chemical_compound Ammonium hydroxide Chemical engineering chemistry Reagent Self-healing hydrogels Polymer chemistry Materials Chemistry Hydroxide |
| Zdroj: | Journal of Applied Polymer Science. 104:1043-1048 |
| ISSN: | 1097-4628 0021-8995 |
| Popis: | A method to incorporate 2,2'-(or 4,4'-)dipyridyl and tetra-n-butylammonium hydroxide into poly(vinyl alcohol) (PVA) monoliths and the controlled-release properties of these polymer monoliths for delivery of the reagents are reported. The monoliths were prepared by heating PVA beads until they formed a viscous liquid and then loading the molten polymers with the desired reagents. Several freeze-thaw cycles were then carried out to provide the mechanically stable, reagent-loaded monoliths. The release of the reagents from the PVA monoliths was monitored by UV-vis spectroscopy, and the release was found to proceed in a controlled manner, yielding consistent results among different reagent-loaded PVA monoliths. In addition, the reagents underwent no chemical changes upon their release from the monoliths. Limitations of the use of the controlled-released chemicals as replenished reagents in Fujiwara reactions for the continuous monitoring of halocarbons are discussed. |
| Databáze: | OpenAIRE |
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