胶束催化N,N-二甲基甲酰胺碱性水解反应

MICELLARCATALYZED ALKALINE HYDROLYSIS OF DIMETHYLFORMAMIDE

根据胶束催化反应的相分离模型和相关的假定建立了适用于底物浓度［Ｓ］≥胶束浓度［Ｍ］时的胶束催化反应动力学方程．４０℃下用热动力学模拟热谱曲线法，在表面活性剂（ＣＴＡＢ、ＳＤＳ、Ｂｒｉｊ３５）胶束溶液中研究了Ｎ，Ｎ二甲基甲酰胺碱性水解反应．应用该方程求得胶束催化反应动力学参数ｋｍ、ｋ２ｍ、结合常数Ｋ１．ＣＴＡＢ、ＳＤＳ和Ｂｒｉｊ３５胶束对该反应有催化作用，讨论了上述胶束对该反应有催化作用的原因．

Based on the pseudophase model of micellar catalysis and some interrelated assumptions,the kinetic equations of micellar catalysis have been derived in the case where the reactant concerntrations are higher than or equal to micellar concerntrations.The alkaline hydrolysis of dimethylformamide has been studied at 40℃ in the micellar solutions of surfactants (CTAB,SDS,Brij35) with analog thermogram method of thermokinetics.The chemical kinetic parameters km and k2m in micellar pseudophase and the association constant of reactant with micelle,K1,have been calculated with the kinetic equations of micellar catalysis.The alkaline hydrolysis of dimethylformamide is catalyzed by all researched micelles.The polar effect and local concerntration effect of micelles can account for the catalysis of micelles.