Synthesis and Characterization of Novel Surfactants Based on 2-Hydroxy-4-(methylthio)butanoic Acid: 2. Non-ionic Surfactants
| Autor: | Scott A. Long, Jeffrey H. Harwell, Kyle A. Karinshak, Graciela B Arhancet, Guangzhe Yu, Brian P. Grady |
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| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution General Chemical Engineering Carboxylic acid Sodium chemistry.chemical_element Sulfoxide 01 natural sciences Micelle Sulfur 010305 fluids & plasmas Surfaces Coatings and Films chemistry.chemical_compound chemistry Pulmonary surfactant 0103 physical sciences Organic chemistry Carboxylate Physical and Theoretical Chemistry 010306 general physics |
| Zdroj: | Journal of Surfactants and Detergents. 20:503-519 |
| ISSN: | 1558-9293 1097-3958 |
| Popis: | Hydroxy-4-(methylthio)butanoic acid (HMTBA) is a commonly used animal feed additive available in large quantities. In this study, anionic surfactants were synthesized utilizing HMTBA as a starting material. Specifically, a straight- chain fatty acid containing 12 or 16 carbon atoms was attached to the hydroxyl group via esterification. After neutralization of the carboxylic acid with sodium, the molecules behave as anionic surfactants. Oxidation of the sulfur atom can be per- formed to further increase water solubility. The molecules exhibit critical micelle concentrations (CMCs), and lower the surface tension to 35-45 mN/m at the CMC. The derivatives have low Krafft points (\4 C) and good wetting performance. The hardness tolerance of the ester made from dodecanoic acid is *2.5-4 orders of magnitude higher than an analogous car- boxylate surfactant, namely sodium dodecanoate. Foam created according to the Ross-Miles foam test is substantial, but dissi- pates quickly as compared to other anionic surfactants. |
| Databáze: | OpenAIRE |
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