Liu Fa
2016
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Journal
China Surfactant Detergent & Cosmetics
Abstract
Hexadecyl dimethyl tertiary amine and octadecyl dimethyl tertiary amine were separately used as starting material and to be reacted successively with hydrochloric acid and epichlorohydrin to prepare two intermediates,N-( 3- chloro- 2- hydroxy) propyl- N,N- dimethyl hexadecyl ammonium chloride and N-( 3- chloro- 2- hydroxy) propyl- N,N- dimethyl octadecyl ammonium chloride. Then ethylene di- amine reacted with the two intermediates successively in presence of sodium carbonate to obtain the product asymmetric Gemini surfactant( symbolized as 16- X- 18). The intermediates and the product were characterized by IR and ~1H NMR as well as the surface activities of 16- X- 18 were measured by conductivity method. Results showed that Krafft point of the product is below 0 ℃,and its cmc at 25 ℃ is 2. 935 × 10~(-5)mol / L. The degree of combination with the counter- ion decreases as the temperature rises.