聚氧乙烯醚型表面活性剂的合成及表面性质

Surface and Interfacial Properties of Polyoxyethylene Ether-type Surfactants

合成了一系列不同聚合度的聚壬基酚聚氧乙烯醚型非离子表面活性剂,通过红外光谱和核磁共振等手段对其结构进行表征,用表面张力法对合成产物的表面性能进行研究.结果表明,随着表面活性剂分子中亲水基团环氧乙烷(EO)片段的增加,单体、二聚体和三聚体的临界胶束浓度(cmc)值都逐渐增大,当EO数目相同时,单体、二聚体和三聚体的cmc值依次明显降低.二聚体与三聚体都显示出很好的表面性质,其中三聚体的表面性质比二聚体表面性能更优.在空气/水表面二聚体和三聚体比单体的排列更加紧密,表现出更好的吸附和分散性能.

A series of poly nonylphenol polyoxyethylene ether nonionic surfactants with different polymeriza-tion degerees was synthesized with nonyl phenol and formaldehyde. The structures were characterized by infra-red spectroscopy and nuclear magnetic resonance. Moreover, the surface properties were evaluated using the surface tension method. It is found that critical micelle concentration（cmc） of monomer, dimer and trimer in-cease with increasing of the number of hydrophilic group epoxyethane（EO） of the surfactants. In the case of the same number of EO, the cmc of surfactants were significantly reduce with the increase of the degree of polymerization. Although dimer and trimer show good surface properties, the surface property of trimer is more excellent than dimer. Moreover, dimer and trimer show more excellent adsorption and dispersion performance because the arrangments of them on the air/ water boundary are significantly more compacted than dimer.