γ-环糊精的玻璃化及热分解动力学的研究  

Glass Transition and Thermal Decomposition Kinetics of γ-Cyclodextrin by DSC

作　　者：曹新志[1] 金征宇[1] 

机构地区：[1]江南大学食品学院,无锡214036

出　　处：《中国粮油学报》2005年第2期37-40,共4页Journal of the Chinese Cereals and Oils Association

摘　　要：用差示扫描量热法(DSC)研究了γ-环糊精的玻璃化温度和热分解动力学,按Kissinger方程和Ozawa方程计算反应的活化能,分别为191. 3kJ/mol和190. 8kJ/mol,并按Ozawa方法计算得指前因子为3. 559×1017min-1。从DSC曲线图上获得焓变(△H)为21. 2kJ/mol,熵变(△S)为0. 0376kJ/(moL·K), 速度常数k为0. 722min-1,半衰期为57. 88秒,玻璃化温度为63℃。The glass transition temperature and thermal kinetics of γ-cyclodextrin were examined by differential scanning calorimetry (DSC). By the Kissinger’s equation and Ozawa’s equation, the activation energy of thermal degradation of γ-cyclodextrin are 191.3 kJ/mol and 190.8kJ/mol, respectively. Our examine results are in good agreement with them. The preexponential factor (A) is 3.559×10 17 according to method of Ozawa. The enthalpy change is 21.2kJ/mol and entropy change 0.0376kJ/mol﹒K, speed constant 0.722 min -1 , half life 57.88 second, and glass transition temperature 63℃.

关 键 词：热分解动力学 Γ-环糊精 差示扫描量热法 玻璃化温度 MOL 指前因子 速度常数 活化能 曲线图 DSC 半衰期 计算 方程 

分 类 号：TS231[轻工技术与工程—粮食、油脂及植物蛋白工程] O614.121[轻工技术与工程—食品科学与工程]