Thermal Characteristics and Kinetic Parameters Assessment of Chitosan

Abstract

In the present study, thermal decomposition kinetics of chitosan was investigated by a thermal analyzer. Firstly, the experiments were performed at three different heating rates from 30 °C to 800°C under inert atmosphere. The results showed that heating rates significantly affected the maximum peak temperatures but it did not affect the conversion. When the heating rates increased, the maximum peak temperatures shifted towards the higher temperature region. In the second part, TG kinetic data was used to calculate the activation energies based on Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS), Starink and Tang kinetic models. All models used provided accurate fits of experimental data and yielded acceptable errors. The values of the average activation energy for FWO, KAS, Starink and Tang models were determined to be 148.5, 146.4, 148.3 and 146.7 kJ/mol, respectively.  

Keywords

• chitosan,kinetic,thermal decomposition,activation energy

References

1. Akahira T, Sunose T 1971. Method of determining activation deterioration constant of electrical insulating materials. Res. Rep. Chiba Inst. Technol (Sci Technol), 16: 22-31.
2. Ebrahimzad H, Khayati GR, Schaffie M 2017. Preparation and kinetic modeling of -Co(OH)2 nanoplates thermal decomposition obtained from spent Li-ion batteries. Advanced Powder Technology, 28: 2779-2786.
3. Flynn JH, Wall LA 1966. General treatment of the thermogravimetry of polymers. J. Res. Nat. Bur. Stand, 70: 487-523.
4. Kast CE, Valenta C, Leopold M, Bernkop-Schnürch A 2002. Design and in vitro evaluation of a novel bioadhesive vaginal drug delivery system for clotrimazole. Journal of Controlled Release, 81 (3): 347-354.
5. Moussout H, Ahlafi H, Aazza M, Bourakhouadar M 2016. Kinetics and mechanism of the thermal degradation of biopolymers chitin and chitosan using thermogravimetric analysis. Polymer Degradation and Stability, 130: 1-9.
6. Moussout H, Ahlafi H, Aazza M, Bourakhouadar M, Amechrouq A 2018. Bentonite/chitosan nanocomposite: Preparation, characterization and kinetic study of its thermal degradation. Thermochimica Acta, 659: 191-202.
7. Nicolescu LC, Tita B, Jurca T, Marian E, Tita D 2015. Thermal Stability of Piroxicam – Active Substance and Tablets. I. Kinetic study of the active substance under nonisothermal conditions. Rev. Chim.-Bucharest, 66: 1802-1806.
8. Ozawa T 1965. A new method of analyzing thermogravimetric data. Bulletin Chem. Soc. Japan, 38: 1881-1886.

9. Starink M 1966. A new method for the derivation of activation energies from experiments performed at constant heating rate. Thermochimica Acta, 288: 97-104.
10. Qu X, Wirsen A, Albertsson C 2000. Effect of lactic/glycolic acid side chains on the thermal degradation kinetics of chitosan derivatives. Polymer, 41 (13): 4841-4847.
11. Zhou L, Wang Y, Liu Z, Huang Q 2009. Characteristics of equilibrium, kinetics studies for adsorption of Hg(II), Cu(II), and Ni(II) ions by thiourea-modified magnetic chitosan microspheres. Journal of Hazardous Materials, 161 (2-3): 995-1002.