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| Mechanism and Kinetics of Thermal Dissociation of Inclusion Complex of β-Cyclodextrin and 1-Methylcyclopropene |
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Yi He1,2, Ting Sun*1
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1.Department of Chemistry, College of Science, Northeastern University, Shenyang 110004, China;2.Department of Environmental Science and Engineering, Jilin Institute of Chemical Technology,Jilin 132022, China
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| Abstract: |
| The inclusion-complex of CD-MCP (β-cyclodextrin (β-CD) including 1-methylcyclopropene (1-MCP)) was prepared and characterized. Basing on programmed-heating procedure and weight-temperature analysis, as well as the application of Satava- Sestak's, Ozawa's and Kissinger's methods, the mechanism and kinetics of thermal dissociation of this inclusion complex were studied. An additional mass loss is found at 170-180 ℃.The mechanism of thermal dissociation of CD-MCP is dominated by a one-dimensional random nucleation and subsequent growth process (A2/3). The activation energy ES and the pre-exponential factor As for the process are 102.14 kJ/mol and 3.63×1010 s-1, respectively. This Es value shows that there is no strong chemical interactions betweenβ-CD and 1-MCP. |
| Key words: 1-methylcyclopropene, β-cyclodextrin, Inclusion complex, Kinetics, Mechanism, Thermal dissociation |
| FundProject: |
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| β-CD/1-MCP包结物热分解反应机理及动力学 |
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何翊1,2, 孙挺*1
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1.东北大学理学院化学系,沈阳,110004;2.吉林化工学院环境科学与工程系,吉林,132022
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| 摘要: |
| 用溶液法制备了β-CD与1-MCP的包结物,并借助于热分析和X射线粉末衍射法证实了包结物的存在,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包结物热分解反应在170～180℃出现失重,其机理为一维随机成核和随后生长反应,反应机理函数为2/3级反应,其降解反应的活化能为102.14 kJ/mol,指前因子值为3.63×1010s-1较低的表观活化能说明了β-CD与1-MCP之间没有形成强烈的化学键. |
| 关键词: 1-甲基环丙烯 β-环糊精 包结物 动力学 反应机理 热分解 |
| DOI：10.1360/cjcp2006.19(1).89.4 |
| 分类号: |