用最大气泡压力法分别测定了不同环氧乙烷(EO)加合数(10、12、14、16、20)的蓖麻油酸甲酯乙氧基化物(ECAME)水溶液的动态表面张力(DST).考察了浓度、温度和无机电解质对DST的影响,探讨了不同浓度时DST参数(动态表面张力特性参数n,平衡时间t*,曲线最大斜率R1/2)的变化规律.结果表明,随着EO数由10增加到20,DST不断增大;随着浓度由0.5×10-5 mol/L增加到10×10-5 mol/L,n由3.02减小到1.05,t*值由14.45减小到2.29,R1/2由0.43增大到6.44,则动态表面活性增大,DST降低;随着温度由25℃升高至45℃,DST降低;吸附初期DST曲线随无机电解质浓度的增大而升高,吸附后期DST曲线随无机电解质浓度的增大而降低.和常规的脂肪酸甲酯乙氧基化物(FMEE)相比,ECAME的动态表面活性更加优异,这为开拓ECAME的应用指明了新的方向.
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