支链N，N-二甲基烷基胺氧化物表面活性剂的合成，表面性质和自聚集行为,Journal of Surfactants and Detergents

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支链N，N-二甲基烷基胺氧化物表面活性剂的合成，表面性质和自聚集行为
Journal of Surfactants and Detergents ( IF 1.6 ) Pub Date : 2018-09-28 , DOI: 10.1002/jsde.12205
Antonio Fabozzi ₁ , Rosa Vitiello ₁ , Irene Russo Krauss _{1,

2} , Mauro Iuliano ₁ , Gaetano De Tommaso ₁ , Angela Amoresano ₁ , Gabriella Pinto ₁ , Luigi Paduano _{1,

2} , Christopher Jones ₃ , Martino Di Serio ₁ , Gerardino D'Errico _{1,

2}

Affiliation

氧化胺表面活性剂已成为洗涤剂配方的高度稳定，无毒且具有成本效益的成分，特别是作为润湿剂和泡沫促进剂。为了增强其功能行为，该家族的一个新成员N，N-二甲基-2-丙基庚烷-1-胺氧化物带有支链烷基尾（C ₁₀DAO-支链）的合成和纯化从2-丙基庚烷-1-醇开始，采用简单易扩展的策略。二维核磁共振（NMR）和质谱法证实了所需产物的高收率和纯度。如电位滴定法所示，支链表面活性剂的质子化行为不受烷基尾支链的影响。相比之下，支链C ₁₀ DAO的表面活性和聚集行为与线性类似物N，N-二甲基癸基-1-胺氧化物（C ₁₀DAO-linear），因为它分别在溶液界面处占据较大的面积，并且以更高的浓度聚集，形成较大的聚集体，分别使用张力测定法和动态光散射（DLS）进行检测。支链的C ₁₀ DAO的聚集行为对pH变化较不敏感。发泡测试表明，在酸性和碱性溶液中，支链C ₁₀ DAO均比其线性类似物更有效。实验结果表明，支化表面活性剂可用于需要增强的和不依赖pH值的表面活性和发泡性的应用中。

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Synthesis, Surface Properties, and Self‐Aggregation Behavior of a Branched N,N‐Dimethylalkylamine Oxide Surfactant

Amine‐oxide surfactants have emerged as highly stable, nontoxic, and cost‐effective constituents of detergent formulations, specifically as wetting agents and foam boosters. With the aim of enhancing their functional behavior, a new member of this family, N,N‐dimethyl‐2‐propylheptan‐1‐amine oxide, bearing a branched alkyl tail (C₁₀DAO‐branched) was synthesized and purified using a simple and easily scalable strategy starting from 2‐propylheptan‐1‐ol. 2D‐nuclear magnetic resonance (NMR) and mass spectrometry confirm the obtainment of the desired product in high yield and purity. The protonation behavior of the branched surfactant is not affected by alkyl tail branching, as shown by potentiometric titrations. In contrast, surface activity and aggregation behavior of C₁₀DAO‐branched is dramatically different from that of the linear analog N,N‐dimethyldecyl‐1‐amine oxide (C₁₀DAO‐linear), in that it occupies a higher area at the solution interface and aggregates at much higher concentration, forming larger aggregates, as detected using tensiometry and dynamic light scattering (DLS), respectively. Aggregation behavior of C₁₀DAO‐branched is less sensitive to pH variations. Foaming tests show that C₁₀DAO‐branched is a more effective foam booster than its linear analog, in both acidic and basic solutions. The experimental results indicate that the branched surfactant can be used in applications that require enhanced and pH‐independent surface activity and foamability.

更新日期：2018-09-28

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