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Kinetics and mechanism of the thermal degradation of biopolymers chitin and chitosan using thermogravimetric analysis
- Source :
- Polymer Degradation and Stability. 130:1-9
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- In this work, the kinetics of thermal degradation of chitin and chitosan polymers were investigated by means of Fourier Transform Infrared Spectroscopy and thermogravimetric analyses in air atmosphere, under dynamic conditions in the range of 298–873 K. The kinetic parameters, such as the apparent activation energy (E a ) and pre-exponential factor (A) were determined using Ozawa–Flynn–Wall (OFW) and Kissinger–Akahira–Sunose (KAS) isoconversional methods. The experimental data were found, in the range of conversion fraction 0.1 f ( α ) = cα m (1− α ) n with the adjusted values of m, n and c. It was found that the simulated curves issued from the model best fit those issued from the experimental data, indicating the same scission mechanism for the degradation of chitin and chitosan. It was found that the average value of E a = 125 kJ/mol used in the simulated curves of chitin, Y (α) and Z (α), is comparable to those calculated by KAS and OFW, while for chitosan, it represents the mean value (E a = 169 kJ/mol) between the values of E a calculated by KAS (E a = 191.61 kJ/mol) and OFW (E a = 146.50 kJ/mol) methods.
- Subjects :
- chemistry.chemical_classification
Thermogravimetric analysis
Materials science
Polymers and Plastics
Kinetics
02 engineering and technology
Activation energy
Polymer
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
Kinetic energy
01 natural sciences
0104 chemical sciences
Chitosan
chemistry.chemical_compound
Chitin
chemistry
Mechanics of Materials
Polymer chemistry
Materials Chemistry
Physical chemistry
Fourier transform infrared spectroscopy
0210 nano-technology
Subjects
Details
- ISSN :
- 01413910
- Volume :
- 130
- Database :
- OpenAIRE
- Journal :
- Polymer Degradation and Stability
- Accession number :
- edsair.doi...........a40cc5bf6c920106a5b1030f1d460c85