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- Title
Synthesis and properties of novel surfactants based on triethylene diamine.
- Authors
CHU Jia-le; PAN Zhong-wen; XUAN Jun; WANG Han-bin
- Abstract
Triethylene diamine reacted with n-bromodecodecyl, tetradecane and cetane to obtain monoquaternary ammonium salt, and then reacted with ethyl chloroacetate to obtain a series of novel hetero surfactants(structural formula as BrCnH2n+1N(CH2CH2)3NCH2COO, n=12, 14, 16, named 3a, 3b, 3c) after alkaline hydrolysis and purification, with the total yield of 78.8%, 80.6% and 83.0% (based on triethylene diamine), respectively. The structure was characterized by NMR, ESI-MS and FT-IR, and their surface properties and thermodynamic parameters were studied. The results showed that at 298.15K, the cmc values of 3a, 3b, 3c are 0.627, 0.576 and 0.502 mmol/L by the conductivity method (the empirical equation is cmc=1.005 3-0.031 25 n); the γcmc values are 38.23, 37.83 and 36.65 mN/m by the hanging drop method (the empirical equation is γcmc =43.10-0.395 n); the Krafft points are 6, 10 and 13 °C, respectively. The temperature adaptation range is wide. The foaming and foam stability are good, in which the initial foam height of 3c is 100 mm and it drops to 61 mm after 30 min. The emulsification time are 260, 348, and 485 s, respectively. The calculation of thermodynamic parameters showed that the formation of micelles is an entropy-driven spontaneous exothermic process.
- Subjects
TRIETHYLENEDIAMINE; SURFACE active agents; BODY temperature regulation; SURFACE properties; CHEMICAL purification; AMMONIUM salts; DIAMINES
- Publication
China Surfactant Detergent & Cosmetics (1001-1803), 2021, Vol 51, Issue 1, p21
- ISSN
1001-1803
- Publication type
Article
- DOI
10.3969/j.issn.1001-1803.2021.01.004