The experimental determination of HSP for polymers is performed using a set of solvents of known HSPs. Can a similar procedure be used for the estimation of HSP for a particular liquid mixture? Classical methods involve the use of thermodynamics and/or group contribution methods, but for multicomponent liquid mixtures these methods could be difficult or inaccurate, and a direct experimental determination would be desirable. Preliminary tests to validate this idea were done using a pure liquid of known HSP, mixing it with a standard set of solvents and calculating its HSP using the HSPiP software. However the accuracy of the results was not good enough. Any suggestion? Thanks.
Dear Dr. Hernandez, discussion about solubility parameters ( rich in apologists of HSP excellence ) look at https://www.researchgate.net/post/How_can_I_use_solubility_parameters_to_show_that_a_polymer_is_soluble_in_a_solvent
I have unfolllow this subtopic, because believe that it is unequal replacement of full and direct set of data (real solubility) on indirect (calculated and approximated) set of derivatives. Some exclusions from HSPiP was corrected recently, but cited by Wiki example with poly(vinylfluoride), polymer shape dependence and your example lead to grievous resume - solubility parameters and HSPiP are templet for house painters. But not scientific instrument with predictive power.
In your case I think situation may be caused by (strong) interaction between different solvents molecules. If the interaction between the solvent is weakly dependent on their molar ratio, the parameters can be obtained. Probably) Be sure, you are not alone with such problem - I've seen similar problems question on RG from other people.
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