Controlled-release polymers for delivery of dipyridyls and tetraalkyl ammonium hydroxide

✍ Scribed by Nathan A. Carrington; D. Lynn Rodman; Kisholoy Goswami; Zi-Ling Xue

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 175 KB
• Volume: 104
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.25859

✦ Synopsis

Abstract

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. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 1043–1048, 2007