Gamiz-Gonzalez, MA.; Correia, D.; Lanceros-Mendez, S.; Sencadas, V.; Gómez Ribelles, JL.; Vidaurre, A. (2017). Kinetic study of thermal degradation of chitosan as a function of deacetylation degree. Carbohydrate Polymers. 167:52-58. https://doi.org/10.1016/j.carbpol.2017.03.020
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/153116
Title:
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Kinetic study of thermal degradation of chitosan as a function of deacetylation degree
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Author:
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Gamiz-Gonzalez, Mª Amparo
Correia, D.M.
Lanceros-Mendez, S.
Sencadas, V.
Gómez Ribelles, José Luís
Vidaurre, Ana
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UPV Unit:
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Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada
Universitat Politècnica de València. Departamento de Termodinámica Aplicada - Departament de Termodinàmica Aplicada
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Issued date:
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Abstract:
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[EN] Thermal degradation of chitosan with varying deacetylation degree (DD) ranging between 50 and 85% was analyzed by dynamic thermogravimetric analysis at different heating rates. The present study focused on the temperature ...[+]
[EN] Thermal degradation of chitosan with varying deacetylation degree (DD) ranging between 50 and 85% was analyzed by dynamic thermogravimetric analysis at different heating rates. The present study focused on the temperature range between 500 and 800 K, above water evaporation. Thermal degradation showed a main degradation stage in this temperature interval with a second stage that appeared in the weight derivative curves as a shoulder in the high temperature side of the main peak with increasing intensity as the DD decreased. The Kissinger and isoconversional Ozawa-Flynn-Wall models were employed to evaluate the Ea of both thermal degradation processes. Different kinetic models were tested to computer simulate the thermogravimetric traces calculating the model parameters with a non-linear least squares fitting routine. The Sestack-Berggren model allowed reproducing accurately the overlapping of the two degradation mechanisms and calculating the mass fraction lost in each of them revealing the coupling between the two degradation mechanisms.
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Subjects:
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Chitosan
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Deacetylation degree
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Thermal degradation
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Thermogravimetric analysis
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Kinetic models
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Activation energy
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Copyrigths:
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Reserva de todos los derechos
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Source:
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Carbohydrate Polymers. (issn:
0144-8617
)
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DOI:
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10.1016/j.carbpol.2017.03.020
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Publisher:
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Elsevier
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Publisher version:
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https://doi.org/10.1016/j.carbpol.2017.03.020
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Project ID:
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info:eu-repo/grantAgreement/FCT//SFRH%2FBPD%2F121526%2F2016/
info:eu-repo/grantAgreement/FCT/5876/147414/PT/Physics Center of Minho and Porto Universities/
info:eu-repo/grantAgreement/MICINN//BES-2011-044740/ES/BES-2011-044740/
info:eu-repo/grantAgreement/MINECO//MAT2013-46467-C4-1-R/ES/ESTIMULACION MECANICA LOCAL DE CELULAS MESENQUIMALES DE CARA A SU DIFERENCIACION OSTEOGENICA Y CONDROGENICA EN MEDICINA REGENERATIVA/
info:eu-repo/grantAgreement/MINECO//MAT2016-76039-C4-1-R/ES/BIOMATERIALES PIEZOELECTRICOS PARA LA DIFERENCIACION CELULAR EN INTERFASES CELULA-MATERIAL ELECTRICAMENTE ACTIVAS/
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Thanks:
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Thermal degradation of chitosan with varying deacetylation degree (DD) ranging between 50 and 85% was analyzed by dynamic thermogravimetric analysis at different heating rates. The present study focused on the temperature ...[+]
Thermal degradation of chitosan with varying deacetylation degree (DD) ranging between 50 and 85% was analyzed by dynamic thermogravimetric analysis at different heating rates. The present study focused on the temperature range between 500 and 800 K, above water evaporation. Thermal degradation showed a main degradation stage in this temperature interval with a second stage that appeared in the weight derivative curves as a shoulder in the high temperature side of the main peak with increasing intensity as the DD decreased. The Kissinger and isoconversional Ozawa-Flynn-Wall models were employed to evaluate the Ea of both thermal degradation processes. Different kinetic models were tested to computer simulate the thermogravimetric traces calculating the model parameters with a non-linear least squares fitting routine. The Sestack-Berggren model allowed reproducing accurately the overlapping of the two degradation mechanisms and calculating the mass fraction lost in each of them revealing the coupling between the two degradation mechanisms.
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Type:
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Artículo
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