食品科学 ›› 2006, Vol. 27 ›› Issue (2): 42-45.

• 基础研究 • 上一篇    下一篇

β—CD/1—MCP包结物热分解反应最可几机制的判断

 何翊, 孙挺   

  1. 东北大学理学院化学系; 吉林化工学院环境科学与工程系
  • 出版日期:2006-02-15 发布日期:2011-09-05

1-甲基环丙烯; β-环糊精; 热分解反应机理; 热重法; 非等温动力学;

 HE  Yi, SUN  Ting   

  1. 1.Department of Chemistry, College of Sciences, Northeastern University; 2.Deptarment of Environmental Science and Engineering, Jilin Institute of Chemical Technology.
  • Online:2006-02-15 Published:2011-09-05

摘要: 本文用热重法测定了β-CD与1-MCP包结物在程序升温条件下的热降解失重过程,采用Satava-Sestak法,并结合Ozawa法和Kissinger法,推断出可能的热分解反应机理,获得了热分解反应的动力学参数。结果表明:β-CD与1-MCP包结物热分解反应的机理为随机成核和随后生长反应,反应机理函数为2/3级反应,动力学方程为:dα/dT=[(A/φ)exp(-E/RT)]·[3(1-α)[-ln(1-α)]1/3]/2,其降解反应的活化能ES为102.14kJ/mol,指前因子AS值为3.63×1010。

关键词: 1-甲基环丙烯, &beta, -环糊精, 热分解反应机理, 热重法, 非等温动力学

Abstract:  The inclusion complex of β-CD and 1-MCP was subjected to programmed heating process and weight-temperature data were recorded by thermogravimetric analyzer. Probable decomposition kinetics parameters were suggested by means of Satava-Sestak method, Ozawa method and Kissinger method as well. And kinetics parameters were obtained, too. The experi- mental result showed that the decomposition kinetics model forβ-CD and 1-MCP was stochasticly becoming stone with succedent growth, while the activating energy was 102.14kJ/mol, with pre-exponential factor as 3.63×1010. The kinetic equation of thermal decomposition is expressed as: dα/dT = [(A / φ)exp(- E / RT)]·[3(1-α)[- ln (1-α)]1/3/ 2.

Key words: 1-methylcyclopropene; &beta, -cyclodextrin; mechanism of the thermal decomposition reaction; thermogravimetry; non-isothermal kinetics;