Fluorocarbon modified chitin and chitosan I. Synthesis and characterization of perfluorocarbonyl chitin

Abstract

The esterification reaction of chitin with perflurocarboxylic acid was studied in methanic acid or perfluorocarboxylic acid as solvent. A series of substituted derivatives of trifluoroacyl. perfluorobutyric and perfluorooctanoyl chitin were synthesized. The properties of these chitin derivatives were investigated.

Hydrophobic Chitosan Microparticles: Heterogeneous Phase Reaction of Chitosan with Hydrophobic Carbonyl Reagents

“…Reaction of CHS with PFPA in Formic Acid (Samples CHS-13, CHS-14, and CHS-15). The reaction was carried out according to ref . The modified CHS microparticles were extracted with methanol as well as diethylether in a Soxhlet extractor for 3 days, respectively.…”

“…In principle, the hydrophobic derivatization of chitosan is accessible by N or O substitution reactions. ,− To achieve higher conversion degrees of the chitosan's functional groups highly reactive carbonyl compounds, such as anhydrides or acyl chlorides of aliphatic carbonic acids, were employed. Zhang et al applied fluorocarbon compounds to enhance the hydrophobization effect …”

“…Zhang et al applied fluorocarbon compounds to enhance the hydrophobization effect. 24 Network formation is a usual way of stabilization of polymer layers. In this manner thin chitosan layers or films deposited on supports can be stabilized by cross-linkages.…”