EMULSIFIER

hi there i'm working in ABS manufacturing plant. currently i'm doing some research in polybutadiene polymerisation.
i would like to knw the difference between sodium soap
disproportionated rosin and potassium soap of disproportionated rosin ? do they both have the same emulsifier reactivity?
i did a surface tension test for both the emulsifier and found out that both of them had the same surface tension. does that mean that both the emulsifiers have the same reactivity ?
hope anyone out there can help me in my problem. thank u. pls reply me at snipped-for-privacy@yahoo.com
thank u
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What do you mean by "emulsifier reactivity"?
In general the counterion of an ionic emulsifier will greatly effect the properties of the electric doublelayer, which then dictates the properties and the structure of the micelles. Different counterions possess different charge density, different water coordination shells and different specific binding abilities. In the case for COONa and COOK the HLB-numbers are slightly different, too.
The surface tension is not a measure for the efficiency of an emsulsifier. You should instead look the critical micelle concentration. Or even do some phase studies (a poor man's approach like titrating an emulsifier solution until phase separation occurs might be enough).

You ask here, I answer here.
Regards,     Oliver     
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