等转化率法测定-βCD/1-MCP包结物分解反应的动力学参数

Measurement of the Kinetic Parameters of Decomposition Reaction of β-Cyclodextrin and 1-Methylcyclopropene Inclusion Complex by Iso-conversional Method

用等转化率法测定了-βCD与1-MCP包结物分解反应的动力学参数.结果表明:以ln(Φ/Tm2)~1/Tm和lnTm^1/Tm作图均能得到一条线性关系良好的直线,由此可以求出活化能Ea=101.71 kJ/mol,指前因子A=4.05×1011s-1,活化焓ΔHa=97.81 kJ/mol,活化熵ΔSa=5.03 J/(mol.K).-βCD与1-MCP之间没有形成强烈的化学键,而主要是靠范?华力相结合的.-βCD与1-MCP包结物热分解反应的速率控制步骤是范?华力的断裂,没有新键的形成来补偿旧键断裂的能量消耗.

This paper studies measurement of the thermal decomposition reaction kinetic parameters of β-cyclodextrin and 1-methylcyclopropene inclusion complex by iso-conversional method. The experimental result shows that the relation between ln （Φ/Tm^2）～1/Tm and ln Tm～1/Tm are approximately linear. The activation energy of the thermal decomposition Ea= 101.71kJ/mol. The preexponential factor A is 4.05 × 10^11 s^-1. The enthalpy change is △Ha=97.81 kJ/mol and entropy change △Sa=5.03 J/（mol·K）. Von de Hoff＇s bond between β-cyclodextrin and 1-methylcyclopropene inclusion complex is primarily chemical. So its split is primarily velocity controlling process during the thermal decomposition activation of β-cyclodextrin and 1-methylcyclopropene inclusion complex.