THERMOGRAVIMETRIC STUDIES OF CHITOSAN DERIVATIVES

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dc.contributor.authorCARDENAS, G
dc.contributor.authorBERNAL, L
dc.contributor.authorTAGLE, LH
dc.date.accessioned2024-01-10T12:09:54Z
dc.date.available2024-01-10T12:09:54Z
dc.date.issued1992
dc.description.abstractThe thermal stabilities of chitosan derivatives (chito; 2-amino-2-deoxy(1-4)-beta-D-glucopyranan) have been studied by thermogravimetry (TG) between 25 and 550-degrees-C under nitrogen flow. The kinetic data thus obtained indicate that the thermostabilities decrease in the order, chito-salicylaldehyde > chito-thioglycolic acid > chito > chito-butanoyl chloride > chito-4-Br-aniline > chito-4-NO2benzene > chito-benzoic acid > chito-benzoyl chloride. The thermal stability apparently depends on the kind of bond established between the chitosan and the reactants. Schiff bases are more stable than amides and alkyl amines. The order of reaction for the thermal decomposition of these chitosan polymers ranges between -0.5 and -1.0. This is probably due to several overlapped processes. The pre-exponential factor, the reaction order and the activation energy of the decomposition for chitosan derivatives have been determined.
dc.fechaingreso.objetodigital2024-07-02
dc.format.extent6 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1016/0040-6031(92)80045-X
dc.identifier.issn0040-6031
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/76533
dc.identifier.wosidWOS:A1992HA90100005
dc.information.autorucQuímica;Tagle L;S/I;49327
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final38
dc.pagina.inicio33
dc.publisherELSEVIER SCIENCE BV
dc.revistaTHERMOCHIMICA ACTA
dc.rightsacceso restringido
dc.titleTHERMOGRAVIMETRIC STUDIES OF CHITOSAN DERIVATIVES
dc.typeartículo
dc.volumen195
sipa.codpersvinculados49327
sipa.indexWOS
sipa.trazabilidadCarga SIPA;09-01-2024
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