Synthesis and characterization of chitosan alkyl carbamates

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 completel...

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Published in:Journal of applied polymer science 2002-12, Vol.86 (11), p.2742-2747
Main Authors: Cárdenas, Galo, Paredes, Juan C., Cabrera, Gustavo, Casals, Pedro
Format: Article
Language:English
Subjects:
Applied sciences
biopolymer
chitosan
chitosan derivative
Exact sciences and technology
Natural polymers
NMR
Physicochemistry of polymers
Starch and polysaccharides
thermogravimetric analysis
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cited_by cdi_FETCH-LOGICAL-c3762-be49cd49db17492056165b7884300d9293c62ec48069529ceee61b5c545b30893
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creator Cárdenas, Galo
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description 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
doi_str_mv 10.1002/app.11252
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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. 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subjects Applied sciences
biopolymer
chitosan
chitosan derivative
Exact sciences and technology
Natural polymers
NMR
Physicochemistry of polymers
Starch and polysaccharides
thermogravimetric analysis
title Synthesis and characterization of chitosan alkyl carbamates
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