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对3-烷氧基-2-羟基丙基氟化铵的热失重行为进行研究。采用两种不同的动力学方程，即Coats-Redfen法、Mad-husudhanan-Krishnan-Ninan（MKN）法，算出3-烷氧基-2-羟基丙基氟化铵热分解反应的反应级数n、活化能E、频率因子A等动力学参数。结果表明：3-烷氧基-2-羟基丙基氟化铵热分解是一个阶段完成，反应为一级反应，表观活化能大小与烷氧基碳链长度有关，难易程度与烷氧基的碳链长度有关；其热分解表观活化能随烷氧基碳链数增加起初基本不变，当碳链数达到16时略有降低。其原因为烷氧基碳链较小时，烃基供电子能力起主要作用；当碳链数达到16时，烃基空间位阻逐渐起主要作用。

Thermo gravimetric behavior of 3-alkoxy-2-hydroxypropyl ammonium fluoride was studied using two different kinetic equations,i.e. Coats-Redfen law,Madhusudhanan-Krishnan-Ninan(MKN). Dynamic parameters of reaction order n,activation energy E,frequency factors A for 3-alkoxy-2-hydroxypropyl ammonium fluoride thermal decomposition reaction were calculated. The results show that 3-alkoxy-2-hydroxypropyl ammonium fluoride thermal decomposition is completed in a stage,and the reaction is a first order reaction,the size of the apparent activation energy is related to alkoxy carbon chain length,the difficulty degree of thermal decomposition of 3-alkoxy-2-dihydroxypropyl ammonium fluoride is related to the length of the carbon chain of alkoxy. The apparent activation energy of thermal decomposition is basically unchanged at first with the increase of the number of alkoxy carbon chain,and slightly lowers when the number of carbon chain reaches 16. The reason for the smaller alkoxy chain is that electron-donating capacity of hydrocarbon plays a major role;when the carbon chain reaches 16,hydrocarbyl steric hindrance gradually becomes dominant factor.