正负离子表面活性剂与非离子表面活性剂混合水溶液的相互作用

Interaction Between Cationic-Anionic and Nonionic Surfactants in Mixed Aqueous Solutions

非离子表面活性剂的加溶作用有助于正负离子表面活性剂的溶解,在恰当比例时,能基本保持其表面活性;正负离子表面活性剂与非离子表面活性剂之间的相互作用很弱,容易形成接近“理想”的混合胶团;恒定非离子表面活性剂浓度时,随正负离子表面活性剂浓度增加,溶液的浊点也增加;超过临界胶团浓度后浊点下降。

Cationic-anionic surfactants have a high surface acivity. But they are liable to precipitate as the concentration is slightly over cmc, so their uses are restricted. This paper describes their various surface properties and solubility phenomena when a nonionic surfactant is added into them. The results indicate that (1) owing to solubilization of nonionic surfactant, the solubility of cationic-anionic surfactants is increased and the surface activity of cationic-anionic surfactant is essentially kept constant under the condition of certain proportions; (2) the interaction between cationic-anionic and nonionic surfactants is very small, they can form nearly an ideal mixed micelle; (3) the cloud points of TX-100(8. 33 × 10-3 mol/kg) increase as the concentration of C+C- increases and decrease as the concentration of C+C- goes beyond the cmc.