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Synthesis and Surface Properties of Disodium Monoalkyl Diphenyl Oxide Disulfonate
Author(s) -
Huo Jing,
Liu Xiaochen,
Niu Jinping
Publication year - 2015
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-015-1681-y
Subject(s) - chemistry , surface tension , critical micelle concentration , pulmonary surfactant , alkyl , carbon chain , nuclear chemistry , organic chemistry , micelle , aqueous solution , biochemistry , physics , quantum mechanics
Disodium monoalkyl diphenyl oxide disulfonates (MADS) with different carbon chains (C n ‐MADS, n = 8, 12, 16) were synthesized through the steps of alkylation‐sulfonation‐neutralization using fatty alcohols (C 8 , C 12 , C 16 ), diphenyl oxide and fuming sulfuric acid (20 % free SO 3 ) as reagents. The structures of the products were identified by infrared spectroscopy and electrospray ionization‐mass spectrometry. The surface properties, emulsification, wettability alteration and salinity and hardness tolerance of the products were systematically investigated. The results show that the critical micelle concentration (CMC) of C 8 MADS, C 12 MADS and C 16 MADS are 7.24 × 10 −3 , 1.49 × 10 −3 and 2.09 × 10 −4 mol/L. The surface tensions at the CMC ( γ CMC ) of each product are 37.5, 38.9 and 46.8 mN/m. The negative logarithm of the surfactant concentration in the bulk phase required to produce a 20 mN/m reduction in the surface tension of the solvent ( p C 20 ) increases with the increase in the alkyl chain length. The emulsifying ability of C 12 ‐MADS is better than C 8 ‐MADS and C 16 ‐MADS, and the MADS showed less oil‐wet nature. The salinity and hardness tolerance of MADS is much stronger than that of conventional surfactants.