The relationship between chemical structure and micellar behaviour for two kinds of acrylamide-type anionic surfmers (sodium 2-acrylamido-tetradecane sulfonate, NaAMC₁₄S; sodium 2-acryla- mido-dodecane sulfonate, NaAMC₁₂S) were studied fully. The solubility of NaAMC₁₄S, NaAMC₁₂S and sodium dodecyl sulfonate (SDS) were determined by UV spectrophotometry. The critical micelle concentrations (CMC) at different temperatures were meas-ured by using surface tension method, and their aggregation numbers of micelles were determined by steady-state fluorescence probe method. The experiment results show that the acrylamide-type anionic surfmers have strong solubilities in water because there are a pair of hydrophilic head groups in their mole-cules, resulting in lower Krafft temperatures, greater molecular areas on the aqueous solution surface and lower surface adsorption amounts. So their abilities to decrease surface tension of water are poor (i.e. poor surface activities). Compared with general surfactants, they have higher critical concentrations due to weaker hydrophobic interaction. They have much smaller aggregation numbers of micelles owing to the loose micelles.

Key words: surface-active monomer, acrylamide-type, micellization behavior, structure, property