Please use this identifier to cite or link to this item:
http://digitalrepository.fccollege.edu.pk/handle/123456789/2328
Title: | Kinetics and mechanism of thermal degradation of pentose- and hexose-based carbohydrate polymers |
Authors: | S. Iqbal, Mohammad Akbar, Jamshed Massey, Shazma Masih, Rashid |
Keywords: | Thermogravimetry Isoconversional analysis Thermal degradation Polysaccharides Kinetic triplet Thermal stability Master plots |
Issue Date: | 9-Jul-2012 |
Publisher: | Pub Med |
Abstract: | This work aims at study of thermal degradation kinetics and mechanism of pentose- and hexosebased carbohydrate polymers isolated from Plantago ovata (PO), Salvia aegyptiaca (SA) and Ocimum basilicum (OB). The analysis was performed by isoconversional method. The materials exhibited mainly two-stage degradation. The weight loss at ambient–115 ◦C characterized by low activation energy corresponds to loss of moisture. The kinetic triplets consisting of E, A and g(˛) model of the materials were determined. The major degradation stage represents a loss of high boiling volatile components. This stage is exothermic in nature. Above 340 ◦C complete degradation takes place leaving a residue of 10–15%. The master plots of g(˛) function clearly differentiated the degradation mechanism of hexose-based OB and SA polymers and pentose-based PO polymer. The pentose-based carbohydrate polymer showed D4 type and the hexose-based polymers showed A4 type degradation mechanism. |
URI: | http://digitalrepository.fccollege.edu.pk/handle/123456789/2328 |
Appears in Collections: | Chemistry Department |
Files in This Item:
File | Description | Size | Format | |
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CP2012(2).pdf | 1.13 MB | Adobe PDF | View/Open |
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