Thermal Degradation Study of Sodium Alginate-Zeolite 4A Composites
Natural biodegradable materials have now received ever-increasing attention in the food industriesas they provide an alternative as green packaging materials to conventional non-degradable plastic films, andtheir utilizations once commercialized will extremely reduce the dependence and consumption of nonrenewablefossil resources. Thus, there is imminent need to develop highly-performed biodegradable materials forfood packaging applications. In this work, a few zeolite 4A modified sodium alginate films have been fabricatedusing the solution casting method. The aqueous dope with different zeolite loadings was cast on cleanglasses, followed by ambient drying treatment before obtaining final hybrid films. Then the membrane thermalproperties have been characterized in detail to investigate the pyrolysis characteristics and kinetics in thecourse of heating process. The experiments were performed at the air flow rate of 30 ml/min with temperaturefrom ambient up to 1050 K. From experimental results, thermal degradation of the sodium alginate compositescould be clearly separated into several stages based on the weight loss and the weight loss rate. The kineticparameters for the main degradation phase thus were estimated by using the pseudo first-order assumption.The heating rates used for sodium alginate hybrid membranes ranges from 5 to 30 K/min so as to evaluateits influences on the thermal degradation. The results have also shown that the introduced zeolite as wellas its content has obviously affected the thermal properties of the sodium alginate composites. These pyrolysisinvestigations will be useful for better understanding the thermal stability of these sodium alginate biocompositesand provide necessary information for thermally processing packaging wastes from these biodegradablematerials.
Huang Zhen Yang Xiaoxu Pan Xi Zhao Yulong Feng Meifen Zhao Qiang
Department of Packaging Engineering Tianjin University of Commerce Tianjin 300134, China
国际会议
The 17th IAPRI World Conference on Packaging(第17届世界包装大会)
天津
英文
406-409
2010-10-12（万方平台首次上网日期，不代表论文的发表时间）