摘要
测定了大庆原油与烷醇酰胺表面活性剂（Cn（m＋m））的动态界面张力，考察了疏水链长度（11,）和亲水基团数（m）的影响。结果表明，m从1增至3，相同碳链长度的烷醇酰胺表面活性剂的界面张力逐渐增加。m=1时，疏水链碳数越多，烷醇酰胺表面活性剂的界面张力并非越低；m为2、3时，表面活性剂的界面张力随疏水链碳数的增加而降低。利用有机概念图进一步研究了系列烷醇酰胺的界面活性，计算出表面活性剂的I／O值（即无机性与有机性的比值）。根据有机概念图理论：IL／0值-11越接近于0，表面活性剂的界面活性越好。c16（1＋1）、C14（1＋1）、C18（1＋1）、C12（1＋1）的11／O值-11分别为0．03、0．09、O．13、0．25，C16（1＋1）的最接近于0，其界面张力大小顺序为：C12（1＋1）〉C18（1＋1）〉C14（1＋1）〉C16（1＋1），和测定结果一致。碳链长度相同时，EO数越大，表面活性剂在有机概念图中的II／O值-11越远离0，表面活性剂的界面活性越差。图8表1参9
Abstract
The dynamic interfacial tension between Daqing oil and alkanolamide surfactant system(Cn(m+m)) was measured and the effect of carbon chain length(n) and hydrophilic groups(m) was studied.Experiment results showed that the interfacial tension of alkanolamide surfactant with the same n increased gradually when m changed from 1 to 3.When the number of hydrophilic groups was of 1,the interfacial tension of alkanolamide surfactant did not decrease with increasing carbon numbers.While m was of 2 or 3,the interfacial tension decreased with increasing n.The interfacial activities of different series alkanolamide surfactants were deeply researched by organic concept map.And the ratio of hydrophilicity to lipophilicity(I/O value) of the surfactants was calculated.Based on the organic concept diagram theory,the more access to zero the |I/O-1| value,the better interfacial activities of alkanolamide surfactants.The |I/O-1| value of C16(1+1),C14(1+1),C18(1+1),C12(1+1) was of 0.03,0.09,0.13,0.25,respectively.That of C16(1+1) was closest to zero,and that of C14(1+1),C18(1+1) and C12(1+1) increased by sequence.The values of calculation were consistent with that of the determination.Therefore,under the condition of the same n,the |I/O-1| value of surfactants in the organic concept diagram would deviate away zero with increasing m,which reflected the worse interfacial activities of the surfactants.
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