Effect of Spacer Chain Character on Surface Activities of Rosin-based Quaternary Ammonium Gemini Surfactants

Two types of rosin-based quaternary ammonium gemini surfactants(Ⅰand Ⅱ) were successfully prepared with tetramethylethylenediamine and triethylenediamine as spacer groups.The results of the surface activity analysis showed that : the critical micelle concentrations(CMC) of Ⅰ and Ⅱ are 1.42×10-4 and 9.7×10-4 mol/L,respectively.The γCMC of Ⅰ and Ⅱ is 36.69,43.41 mN/m,respectively.The emulsifying times of these two gemini surfactants is 16 and 10 min,respectively.The calculated values of pc20 are 4.2 and 3.2,respectively.The calculated value of hydrophile lipophile balance(HLB) of both these two gemini surfactants is 14.45.Ⅰ has good compatibility with anion surfactants,whereas Ⅱ has bad compatibility with anion surfactants.And the effects of the spacer groups′ character on surface activities of quaternary ammonium gemini surfactants were explored.The results showed that rosin-based quaternary ammonium gemini surfactants by flexible chain spacer groups Ⅰ has higher activity than that by rigid chain spacer groups Ⅱ.