Thermal studies of chitin–chitosan derivatives
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New poly(azo) amino-chitosan compounds were obtained from the azo coupling reaction of N-benzyl chitosan and diazonium salts. The thermal behavior of these compounds was studied by thermogravimetric analysis (TG), differential thermogravimetric analysis (DTG), TG coupled with a Fourier-transform infrared, and differential scanning calorimetry (DSC). TG/DTG curves of chitin–chitosan polymer showed two thermal events attributed to water loss and decomposition of the polysaccharide after cross-linking reactions. Thermal analysis of the poly(azo) amino-chitosan compounds showed that the decomposition temperatures decreased when compared to the starting chitin–chitosan and N-benzyl chitosan. DSC results showed an agreement with the TG/DTG analyses. Thermal behavior of poly(azo) amino-chitosans suggest that these compounds could be considered as potential thermal sensors.
KeywordsChitin–chitosan biopolymer N-alkylation Azo compounds TG/DTG and DSC
The authors gratefully thank Fundação de Apoio a Pesquisa do Estado de São Paulo (FAPESP), Programa de Pós-graduação em Ciência e Tecnologia de Materiais (POSMAT), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for financial support and post-graduation fellowship.
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