气氛对壳聚糖及其铜离子混合物热降解的影响  

Effect of Atmosphere on Thermal Degradation of Chitosan and Its Cupric Ion Compound

作　　者：欧春艳[1] 李思东[1] 洪鹏志[1] 杨磊[1] 李程鹏[1] 佘晓东[1] 

机构地区：[1]广东海洋大学理学院,广东湛江524088

出　　处：《化学与生物工程》2009年第8期32-35,共4页Chemistry & Bioengineering

基　　金：广东省科技计划重大资助项目(2003A2030504)

摘　　要：利用热重分析(TGA)和差热分析(DTA)研究了壳聚糖及其铜离子混合物在氮气气氛和空气气氛中的热降解行为,探讨了气氛对壳聚糖及其铜离子混合物热降解的影响,并采用FTIR、X-射线衍射对壳聚糖铜离子混合物进行了表征。结果显示,壳聚糖及其铜离子混合物的热降解和热氧降解分三个阶段进行:第一阶段为材料失水,为吸热反应;第二阶段为主链脱乙酰和糖苷键的裂解,为放热反应;第三阶段为吡喃环的裂解和炭化残渣的分解,为放热反应。气氛对壳聚糖第一、第二阶段的降解影响较小,对第三阶段的降解影响较大。The thermal degradation process of chitosan and its cupric ion compound in nitrogen and in air have been studied by thermogravimetry analysis （TGA） and differential thermal analysis （DTA）. The effect of atmosphere on the thermal degradation behaviors of chitosan and its cupric ion compound is discussed. Fourier transform-infrared （FTIR） and X-ray diffractogram （XRD） analysis are utilized to determine the microstructure of chitosan-cupric ion compound. The results show that the thermal degradation of chitosan and its ctipric ion compound in nitrogen or in air is a three-stage reaction. The first stage is the evaporation of water, which is endothermic. The second stage is the deacetylation of the main chain and the cleavage of glycosidic linkage of chitosan, which is exothermic. And the third stage is the thermal destruction of pyranose ring and the decomposition of residual carbon, which is exothermic. The impact of atmosphere on the thermal degradation of chitosan is less in the first and the second stage, but is greater in the third stage.

关 键 词：壳聚糖 铜离子 热降解 热氧降解 

分 类 号：O636.1[理学—高分子化学] O643.3[理学—化学]