Synthesis and characterization of chitosan alkyl carbamates

Autor:	Gustavo Cabrera, Juan C. Paredes, Galo Cárdenas, Pedro Casals
Rok vydání:	2002
Předmět:	chemistry.chemical_classification Reaction conditions Polymers and Plastics General Chemistry Polymer Surfaces Coatings and Films Chitosan chemistry.chemical_compound Degree of substitution chemistry Polymer chemistry Materials Chemistry Degradation (geology) Organic chemistry Alkyl
Zdroj:	Journal of Applied Polymer Science. 86:2742-2747
ISSN:	0021-8995
DOI:	10.1002/app.11252
Popis:	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
Databáze:	OpenAIRE
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