Thermogravimetric and FTIR studies of chitosan blends |
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| Institution: | 1. Department of Physics, Saint-Petersburg State University, Ulianovskaja 3, 198504 St.Petersburg, Russia;2. Faculty of Chemistry, University of Wroclaw, Joliot Curie 14, 50-383 Wroclaw, Poland;3. Department of Chemistry, University of Antwerp, Groenenborgelaan 171, B-2020 Antwerp, Belgium;1. Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain;2. Chemical Engineering Department, Universidade Federal do Ceará, UFC, 60455-760 Fortaleza, CE, Brazil;3. School of Chemical Engineering, University of Campinas, UNICAMP, P.O. Box 6066, 13081-970 Campinas, SP, Brazil;4. Departamento de Química-Física, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain;1. Department of Food Science, National Taiwan Ocean University, Keelung, Taiwan, ROC;2. Center for Marine Bioenvironment and Biotechnology, National Taiwan Ocean University, Keelung, Taiwan, ROC;3. Department of Food Science, National Penghu University of Science and Technology, Penghu, Taiwan, ROC;1. State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China;2. Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, Jiangsu 214122, China |
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| Abstract: | Results of spectrophotometric and thermogravimetric studies of chitosan (CH) blends with polyvinyl alcohol (PVAL), starch (S) and hydroxypropylcellulose (HPC) obtained by casting from solutions in the form of transparent films containing 0–1.0 weight fraction of CH were discussed. Blends containing S are homogeneous only in the case of low-weight fraction of S (to 0.3).On the basis of results of thermodegradation in dynamic and isothermal conditions, thermal stability of the tested systems was estimated. Thermogravimetric measurements in dynamic conditions were carried out in the temperature range of 100–450 °C at constant heating rate 15 °C/min. From thermogravimetry (TG) and DTG curves the activation energy and characteristic parameters of degradation of the tested blends were determined. The observed growth of activation energy and Tp—temperature of initial weight loss, Tmax—temperature of maximal rate and Ce—degree of conversion at the end of the measurement (at temperature 450 °C) along with the increase of polymer fraction (HPC and S) in the CH blend provides an evidence of improved thermal stability of the systems tested.Investigations in isothermal conditions in air at temperature from 100 to 200 °C confirmed appreciable improvement of CH thermal stability in the blends being tested.Infrared spectroscopic analysis of the blends showed a distinct stabilization of the process of chain scission. In the band at 1080 cm?1 associated with absorption in –C–O–C– group during degradation of the blends at temperature 200 °C much smaller decrease due to molecular scission were observed than in the case of pure CH. |
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