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Kinetic study of thermal degradation of chitosan as a function of deacetylation degree

Journal Article


Abstract


  • 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.

UOW Authors


  •   Gámiz-González, M A. (external author)
  •   Correia, Daniela M. (external author)
  •   Lanceros-Méndez, Senentxu (external author)
  •   Gomes da Silva Sencadas, Vitor
  •   Gomez Ribelles, J L. (external author)
  •   Vidaurre, A (external author)

Publication Date


  • 2017

Citation


  • Gamiz-Gonzalez, M. A., Correia, D. M., Lanceros-Mendez, S., Sencadas, V., Gomez Ribelles, J. L. & Vidaurre, A. (2017). Kinetic study of thermal degradation of chitosan as a function of deacetylation degree. Carbohydrate Polymers, 167 52-58.

Scopus Eid


  • 2-s2.0-85015314929

Number Of Pages


  • 6

Start Page


  • 52

End Page


  • 58

Volume


  • 167

Abstract


  • 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.

UOW Authors


  •   Gámiz-González, M A. (external author)
  •   Correia, Daniela M. (external author)
  •   Lanceros-Méndez, Senentxu (external author)
  •   Gomes da Silva Sencadas, Vitor
  •   Gomez Ribelles, J L. (external author)
  •   Vidaurre, A (external author)

Publication Date


  • 2017

Citation


  • Gamiz-Gonzalez, M. A., Correia, D. M., Lanceros-Mendez, S., Sencadas, V., Gomez Ribelles, J. L. & Vidaurre, A. (2017). Kinetic study of thermal degradation of chitosan as a function of deacetylation degree. Carbohydrate Polymers, 167 52-58.

Scopus Eid


  • 2-s2.0-85015314929

Number Of Pages


  • 6

Start Page


  • 52

End Page


  • 58

Volume


  • 167