烷基芳基磺酸盐结构与性能关系——分子结构变化对c_CMC和HLB 值的影响

StructureandPerformanceofAlkyl m-XyleneSulfonate—EffectofStructuralModificationoncCMC and HLBValue

栾和鑫 吴运强 王宁 陈权生 张海玲 赵文强 孙记夫 吴文祥 曲广淼 丁伟

LUAN Huoxin WU Yunqiang WANG Ning CHEN Quansheng ZHANG Hailing ZHAO Wenqiang SUN Jifu WU Wenxiang QU Guangmiao DING Wei

为揭示烷基芳基磺酸盐结构与性能的关系，研究了系列表面活性剂的油水界面张力及分子结构对最小烷烃碳数（nmin）、临界胶束浓度（cCMC）和亲水亲油平衡值（HLB 值）的影响。结果表明，芳基取代位置相同时，随着长链烷基碳数增加，烷基芳基磺酸盐的cCMC先减小后增大，cCMC越小其界面活性越高，表面活性剂分子在界面上排列越趋近于油/水兼溶型；相同链长的同系物，随着芳基向烷基碳链中间位置移动，其cCMC和nmin呈现增大趋势，芳环取代基对支化程度的影响相当于4.05个亚甲基对cCMC的影响。通过对HLB 值的经验公式对比可知，戴维斯公式适合不同结构表面活性剂间HLB 值的比较，而临界胶束浓度法适于同系物间的比较。图6 表2 参15

In orde r to reveal the relationship between structure and properties of alkyl m-xylene sulfonate ，the interfacial tension of the series surfactants and the effect of molecule structure of surfactants on minimum carbon number of alkane（nmin），critical micelle concentration （cCMC）and hydrophilic-lipophilic balance（HLB）value were studied. The results showed that when aryl-substituted position was the same ，cCMC decreased firstly ，and then increased with increasing number of long alkyl chain. The lower of cCMC，the higher of interfacial activity of the surfactant was. And the molecules of surfactant arranged on the interface toward to oil/water compatible type. And for the same chain length of isomers，when the aryl group moved toward the center of chain，cCMC and nmin increased. The effect of aryl substituent on the degree of branching was equal to the effect of 4.05methylene groups on cCMC. By comparing the empirical equation of HLB value，it was found that Davies equation was suitable for the HLB value comparison between surfactants with different structure，and critical micelle concentration equation was suitable for homologues 。