ヒドロキシル基を有する2-アミノ酸型両性界面活性剤の合成と物性 (第1報)

概要

論文の詳細を見る
2- [N- (2-hydroxyethyl) amino] fatty acid and 2- [N, N-bis (2-hydroxyethyl) amino] fatty acid were prepared by a reaction of 2-bromo methyl ester of fatty acid with monoethanolamine or diethanolamine. Where fatty acids employed were decanoic lauric, myristic, palmitic, and stearic acids. The cmc, the pH-dependence of surface tension and the isoelectric point were measured. The cmc of 2- [N- (2-hydroxyethyl) amino] fatty acid was lower in the order of C10>C12>C14. On the other hand, one of 2- [N, N-bis (2-hydroxyethyl) amino] fatty acid was in the order of C10>C12>C14>C16>C18 and was presented by the formula of log cmc=0.52-0.266 N. Where N was a total carbon number. From the result of surface tension measurement against different pH, 2- [N, N-bis (2-hydroxyethyl) amino] fatty acids with C14 and C16 alkyl chain length had the most steady surface activities in all pH. All these amphoteric surfactants were found to have a wide expanded isoelectric zone and these surface ranges. tensions did not lower even in the isoelectric point probably owing to the effect of the hydroxyl group.
社団法人日本油化学会の論文