表面活性剂复配混合胶束对酯碱性水解反应的影响

The Effect of Mixed Micelle of Surfactant on the Alkaline Hydrolysis of Esters

应用紫外分光光度法和热动力学法研究了芳香酸酯和正脂肪酸乙酯在表面活性剂复配混合胶束（ＳＤＳ－Ｂｒｉｊ３５，ＤＴＡＢ－Ｂｒｉｊ－３５，ＴＴＡＢ－Ｂｒｉｊ３５，ＣＴＡＢ－Ｂｒｉｊ３５，ＣＴＡＢ－Ｔｒｉｔｏｎ Ｘ－１００，ＳＤＳ－Ｔｒｉｔｏｎ Ｘ－１００）中的碱性水解反应。复配胶束对酯的碱性水解反应起禁阻作用，其禁阻作用比单一胶束的禁阻作用强，并讨论了复配胶束对酯碱解起禁阻作用的原因。

The alkaline hydrolyses of aromatic and normal aliphatic acid esters have been studied at 25℃ in mixed micelles of surfactants(SDS-Brij 35,DTAB-Brij 35, TTABBrij 35, CTAB-Brij 35, CTAB-Triton X-100, SDS-Triton X-100)with spectrophotometry and the method of thermokinetics in this paper. The critical micellar concentrations of the corresponding systems have been measured with spectrophotometry. k1m in micellar psuedophase has been calculated.The ratios of k1m to k1w for all mixed micellar systems investigated are less than 1.The alkaline hydrolyses of the esters are inhibited by them. The inhibtion of the mixed micellar systems is stronger than that of corresponding single micellar systems because micropolarity of compact Stern layer of mixed micelles is lower.