Hansen Solubility Parameters of Solvents

Hansen Solubility Parameters of Solvents Table 4.2 Solvent-Resin Solubility Profiles... 

Hansen Solubility Parameters of Solvents TablO 4.5 Polyglycols as Plasticizers... 

Table 9 Hansen solubility parameters of some solvents...

In another study Slobodian et al. (57) found that the percolation threshold for electrical conductivity of MWCNT-PMMA composites depends on the solvent used. The lowest percolation threshold was achieved for toluene where percolation was found to be at 4 wt% of MWCNT, for chloroform at 7 wt% and for acetone at 10 wt%. The highest conductivity was obtained at 20 wt% of MWCNT at values around 4x 10 5 Sc nr1 for composite prepared from toluene solution. They observed that the Hansen solubility parameters of individual solvent play an important role in the dispersion of MWCNT in PMMA. 

Figure 7.1 Hansen solubility parameters of seven alcohols in terms of the polarity and hydrogen bonding values. For comparison, the average values of the ester-type solvents, ether solvents, ketone solvents, and the average values for the E- and P-serics glycol ethers are included.

Figure 19.8 The computer spreadsheet SPCALC.WKl utilizes the contribution constants suggested by Small [I] to calculate the three partial Hansen solubility parameters of a solvent. The solvent specific gravity is also needed for the calculations. Source spreadsheet from the author s files.

Steven Abbott, University of Leeds, U K). Any parameter in the equation can be calculated using the information in this table. References Koenhen DM, Smolders CA (1975) The determination of solubility parameters of solvents and polymers by means of correlations with other physical quantities. J Appl Polym Sci 19 1163-1179 Abbott S, Hansen CM (2008) Hansen solubility parameters in practice, complete with software, data, and examples, 1st edn.( 2008), 2nd edn. (2009), 3rd edn. (2010). ISBN 9780955122026. 

Paine et al. [85] extensively studied the effect of solvent in the dispersion polymerization of styrene in the polar media. In their study, the dispersion polymerization of styrene was carried out by changing the dispersion medium. They used hydroxypropyl cellulose (HPC) as the stabilizer and its concentration was fixed to 1.5% within a series of -alcohols tried as the dispersion media. The particle size increased from only 2.0 /itm in methanol to about 8.3 /itm in pentanol, and then decreased back to 1 ixm in octadecanol. The particle size values plotted against the Hansen solubility parameters... 

Hansen solubility parameters. A convenient scheme for the evaluation of solvency is the use of the Hansen plot, a 3D diagram positioning 8, 5p and of polymer and solvent. 

Hansen CM, Smith AL (2004) Using Hansen solubility parameters to correlate solubility of C60 fullerene in organic solvents and in polymers. Carbon 42 1591-1597. 

In the context of the TMS investigated here, a mediator was needed with a Hansen solubility parameter (HSP) closer to that of the catalyst solvent than to that of NOP. A detailed database of HSPs can be found in the literature [30-32]. 

In addition, the theoretical equations in the Hildebrand and Hansen approaches can be effectively applied to predicting the solubility of a new compound by employing the experimental solubility data of a structurally related compound. The predicted values for the new compound would be based on the experimental one- or three-dimensional solubility parameter of the structurally related compound, and the group additivity principles would be applied to estimate the respective solubility parameter of the second compound. Solubility parameters associated with the Hildebrand and Hansen approaches have proved useful in the selection of not only solvents, but also of other excipients found in formulations (Belmares et al., 2004). 

Predictions of Woo could be performed using global (Hildebrand) or partial (Hansen) solubility parameters, but these are very difficult (and perhaps impossible) to determine accurately from solvent-sorption experiments, so that this way is not realistic. The best experimental approach is, in our opinion, using the ultrasonic modulus. 

Frank et aL reported examples of quickly screening solvents for organic solids. In one particular example, solubilities of aspirin in four different solvents (acetone, ethanol, chloroform, and cyclohexane) were used to regress the Hansen solubility parameters for the solute, aspirin. Once the Hansen solubility parameters are identified for aspirin, Frank et al. showed that one could quickly estimate the solubilities of aspirin in any solvent or solvent mixture as long as the Hansen solubility parameters are also available for the solvents. 

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