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Indexed by:期刊论文

Date of Publication:2014-07-01

Journal:JOURNAL OF SURFACTANTS AND DETERGENTS

Included Journals:SCIE、EI、Scopus

Volume:17

Issue:4

Page Number:629-636

ISSN No.:1097-3958

Key Words:Triazine; Betaine surfactant; Minimum alkane carbon number; Interfacial tension

Abstract:The design, synthesis and interfacial behaviors of six asymmetric carboxyl betaine surfactants (BC (m-n) , m, n = 8, 10, 12, or 14, m not equal n) derived from s-triazine, which were prepared from cyanuric chloride, aliphatic amines, N,N-dimethylpropane-1,3-diamine, followed by the reaction with sodium chloroacetate, are reported. The structures were confirmed by MS, H-1 NMR and FT-IR. Compared with symmetric surfactants (BC (n-n) , n = 8, 10, 12, or 14) we previously synthesized, the asymmetric series show superior surface activity. The gamma(CMC) of surfactants BC10-8, BC12-8, BC14-8 and BC12-10 is all below 30 mN/m. The minimum alkane carbon number of these ten surfactants is determined to be between 10 and 14. The interfacial behaviors between the alkanes and the solutions of triazine carboxyl betaine surfactants show that surfactants with a total carbon number in hydrophobic chains between 16 and 22 exhibit the ability to reduce the interfacial tension to an ultra-low value (10(-3) mN/m). The surfactants with longer hydrocarbon chains display strong affinity to the alkanes with longer chains.