Abstract:

Three kinds of sulfobutane betaines(SBm-4) are characterized by FTIR, 1H NMR and elemental analysis. Surface property, foaming property and emulsifying property of these compounds are studied. The results show that the critical micelle concentration(cmc) for SB12-4 is 2.20×10-3 mol/L, γcmc is 31.48 mN/m; while the cmc for SB14-4 is 2.80×10-4 mol/L, γcmc is 29.68 mN/m; and the cmc for SB16-4 is 2.30×10-5 mol/L, γcmc is 32.06 mN/m. The cmc decreases for the three kinds of sulfo-butane betaines as the alkyl chain length increases, while γcmc first decreases and then increases. As the mass concentration of three kinds of surfactants raised, the foaming power increased firstly, and reached to a certain value essentially unchanged. The foam stability was enhanced gradually with increasing the concentration. As the temperature increased, the foaming power was heightened slowly, while foam stability decreased. As the concentration was increased, the emulsifying power of three kinds of surfactants increased firstly and then decreased.

Key words: sulfo-butane betaines, surface property, foaming property, emulsifying property