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Synthesis and characterization of chitosan alkyl carbamates

✍ Scribed by Galo Cárdenas; Juan C. Paredes; Gustavo Cabrera; Pedro Casals

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
140 KB
Volume
86
Category
Article
ISSN
0021-8995

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✦ Synopsis

Abstract

The synthesis of chitosan methylcarbamate (ChMC) and ethylcarbamate (ChEC) is described by using a new methodology. Polymers with substitution degrees up to 63% for ChEC and 68.5% for ChMC were obtained. Derivatives with lower substitutions were acid soluble but those with higher ones were completely insoluble. This could be due to the loss in hydrophilic sites when the substitution degree increases. The reaction conditions and degree of substitution obtained for both derivatives were also described. A complete chemical characterization was carried out by spectroscopic techniques. The thermal degradation of chitosan and derivatives were studied in the range 25–500°C and both derivatives were shown to be thermally less stable than chitosan. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2742–2747, 2002

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