Adsorption and aggregation properties of homogeneous polyoxyethylene alkyl ether- and ester-type nonionic surfactants with multi-branched double chains
Adsorption and aggregation properties of homogeneous polyoxyethylene alkyl ether- and ester-type nonionic surfactants with multi-branched double chains
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多支链双链均相聚氧乙烯烷基醚和酯型非离子表面活性剂的吸附和聚集性能
DOI：
10.1016/j.colsurfa.2022.129247
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Yoshimura Tomokazu
中科院分区：
文献类型：
--
作者：
Yada Shiho;Yoshioka Yuiko;Ohno Masashi;Koda Toshinari;Yoshimura Tomokazu
合成了多支化双链均相聚氧乙烯(EO)烷基醚和酯型非离子表面活性剂。通过浊点、表面张力和小角X射线散射法研究了它们的吸附和聚集性能，并与具有对称和不对称线性双链的均相环氧烷基醚和酯型非离子表面活性剂以及具有线性单链的传统表面活性剂进行了比较。采用表面能较低的多支化甲基作为表面活性剂的疏水基团时，尽管EO12具有较大的亲水基团，但多支化双链型表面活性剂在临界胶束浓度下的表面张力显著降低到27.9-28.8mN·m−-1。在温度-浓度相图中，由于多支链的空间位阻引起的界面曲率较小，线型双链表面活性剂的层状液晶区域更加宽广。
Homogeneous polyoxyethylene (EO) alkyl ether- and ester-type nonionic surfactants with multi-branched double chains were newly synthesized. Their adsorption and aggregation properties were investigated through cloud point, surface tension, and small-angle X-ray scattering measurements, and compared to those of homogeneous EO alkyl ether- and ester-type nonionic surfactants with symmetric and asymmetric linear double chains as well as a conventional surfactant with a linear single chain. The surface tension at the critical micelle concentration for the multi-branched double-chain type decreased considerably to 27.9–28.8 mN m−1despite having a large hydrophilic group of EO12when multi-branched methyl groups with low surface energy were used as the hydrophobic groups of the surfactants. In the temperature vs. concentration phase diagrams, the regions of lamellar liquid crystals were more extensive for the linear double-chain surfactants because of the small interfacial curvature induced by the steric hindrance of the multi-branched chains.