Abstract
The thermal degradation of pectin was investigated by simultaneous TGA-DSC/FTIR analysis and Hi-Res/modulated-TGA technique under nitrogen atmosphere. Pyrolytic degradation is a complex set of simultaneous and consecutive reactions related to: (i) dehydration at temperatures ≤100°C; (ii) initial depolymerization by breaking the glycosidic linkages for temperature ≤210°C, (iii) secondary degradation of the pectin units between 250 and 580°C, and (iv) direct gasification of char residues at temperatures ≥600°C. Three model-free-kinetics algorithms, Friedman (F), Kissinger–Akahira–Sunouse (KAS) and modulated TGA (MTGA), were used to predict the pyrolytic cracking kinetics. The results are discussed in terms of activation energy, the most probable mechanisms, and their relationship with the structure.
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