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Chitosan/carboxymethyl cashew gum polyelectrolyte complex: synthesis and thermal stability |
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| Authors: | JS Maciel Haroldo CB Paula |
| Institution: | a Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, P.O. BOX 12.200, CEP 60455-760, Fortaleza, Ceará, Brazil b Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, P.O. BOX 12.200, CEP 60455-760, Fortaleza, Ceará, Brazil |
| Abstract: | Chitosan/carboxymethyl cashew gum polyelectrolyte complexes were synthesized using different proportions of chitosan (CH) and carboxymethyl cashew gum (CMCG). The optimum CH:CMCG ratio was 25:75, which produced highest product yield. Polyelectrolyte (PEC) samples were characterized by thermogravimetric analysis and FT-IR spectroscopy. Parameters such as initial and maximal degradation temperatures and activation energy (Ea) were determined. Activation energies follows the order CMCG > CH > PECs samples. Infrared analysis from residual products after heating at 280 °C in different times indicated that cleavage of the glycosidic bond and formation of unsaturated products occurred. |
| Keywords: | Chitosan Carboxymethyl cashew gum PEC Thermal analysis |
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