Recently the EU has pushed to phase out phthalates as plasticizers. Explain how you might be able to identify mixtures of solvents that could potentially replace these using Hansen Solubility Parameters. (Hint: there is a lot out there on similar subjects on the web. Don't copy and paste for your answer

a. 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.

b. Chemically heterogeneous polymers can be separated according to composition by liquid chromatography. Usually, binary gradients are used where solvent strength and polarity are changed simultaneously. A new method employs three-component gradients: the starting eluent is a nonsolvent which ensures proper retention of the injected sample. A solvent.

c. a more rapid and accurate method to determinethe partial or Hansen solubility parameters as well as the radius of interaction sphere for agiven polymer using the tabulated Hansen solubility parameters of solvents. Intrinsic viscosities of a polymer in different solvents and molar volume of solvents were used asweights of dissolving capacities of polymer. Equations.

Explanation :

Therefore C.M. Hansen [31] divided δ into three parts, which represent the specific type of interaction, namely dispersion interactions δD describing the contribution of non-polar London interactions, polar interactions δP describing the forces of two permanent dipoles and hydrogen bonds δH describing the ability of electron exchange based on the acid and base concept of Lewis:

(2)

Thus, instead of comparing cohesion energy density as integral measure for all molecular interactions as it is the case for HP, HSP provide the coordinates of the solute of interest in a more differentiated 3-dimensional interaction space

Solubility of the compound in question is evaluated in a range of liquids with large variation in their 3-dimensional solubility parameters, followed by a ranking of the probe liquids as either good or poor. The boundary between good and poor liquids is described by a sphere, whose center is defined by the HSP coordinates of the solute. Ra describes the distance of a solute

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