Tween80/AEO20体系胶束形成的分子间相互作用

摘要

用wilhelmy吊片法研究了油烯基聚氧乙烯（20）醚（AEO20）/Tween80混合体系的平衡表面张力.探讨了温度对其平衡表面张力的影响,计算了混合体系的表面活性（CMC,γCMC,Γmax,Amin,pC20）,并进一步用Clint和Rubingh理论探讨该混合体系在胶束形成过程中的分子间相互作用参数βm,分子交换能εm.结果表明：在一定条件下,AEO20和Tween80混合体系表面活性得到提高,且混合胶束形成过程中产生较强烈的相互作用.其在25℃时所有配比都有协同效应,在30℃和35℃下,当αAEO20〈0.50时混合体系与理想模型相比表现为负偏离,其βm和εm分别在-1.84--12.47和-0.51kJ/mol--5.32kJ/mol之间.%The surface tension of oleyl polyoxyethylene（20）（AEO20）with Tween80 was determined by a Wilhelmy type surface tension-meter.The influence of temperature on equilibrium surface tension was studied.The interactions between the two surfactant molecules in mixed micelle were studied through CMC,γCMC,pC20,Γmax,Amin.Moreover Clint＇s and Rubingh＇s treatments were used to analyze the molecular interaction parameters（βm） and the molecule exchange energy（εm）.For systems investigated,it showed that surface activity was advanced.There was a stronger synergistic mixing behaviour between AEO20 and Tween80 in some conditions.At 25℃ all mixtures showed synergism most evidently.At 30℃ and 35℃,when αAEO20 0.50 mixtures showed negative deviation,while βm and εm values of the mixed micelles ranged-1.84 and-12.47,-0.51 kJ/mol and-5.32 kJ/mol for all mixtures investigated.