Effects of Additive on Micellization of 2,4-Dimethyl-5-(1'-Butyl)Decyl Benzene Sulfonate Sodium in Aqueous Solution

The thermodynamic properties of the micellization of 2,4-dimethyl-5-(1'-butyl)decyl benzene sulfonic acid sodium were investigated by using surface tension method,and the influences of temperature,inorganic salt and short chain alcohol on the micellization of 2,4-dimethyl-5-(1'-butyl)decyl benzene sulfonic acid sodium in aqueous solution were discussed.The results showed that the micellization of 2,4-dimethyl-5-(1'-butyl)decyl benzene sulfonic acid sodium in aqueous solution was a spontaneous process.With the temperature rising,micellization of 2,4-dimethyl-5-(1'-butyl)decyl benzene sulfonic acid sodium became easier firstly,but then difficult.With the addition of the inorganic salt,the micellization was promoted,and the more the valence state and concentration of the counter-ion,the easier the micellization.Also the addition of the short chain alcohol favored to micellization of 2,4-dimethyl-5-(1'-butyl)decyl benzene sulfonic acid sodium,and the more the number of alcohol alkyl carbon atoms,the easier the micellization.But with the addition of ethanol in aqueous solution,2,4-dimethyl-5-(1'-butyl)decyl benzene sulfonic acid sodium was hard to be micellization.