The molecular structure of a fatty acid ester has

Table 1.
Hansen solubility parameter of the fatty Perifosine methyl esters.δdδd (MPa1/2)δpδp (MPa1/2)δhδh (MPa1/2)δTδT (MPa1/2)Methyl laurate (C12:0)16.02.15.216.9Methyl palmitate (C16:0)16.01.63.616.4Methyl stearate (C18:0)15.91.43.216.3Methyl oleate (C18:1)16.11.53.516.6Methyl linoleate (C18:2)16.21.63.916.7Methyl linolenate (C18:3)16.21.74.216.8Data from Ref. [19].Full-size tableTable optionsView in workspaceDownload as CSV
The difference between the solubility parameter of a solvent and NBR could then be determined using the Δδ¯ factor [19].equation(7)Δδ¯=(δds-δdNBR)2+(δps-δpNBR)2+(δhs-δhNBR)2
For good compatibility between a solvent and NBR, the difference between the solubility parameters should be small. The calculated results of Δδ¯ are 6.67, 7.13 and 7.39 for C12:0, C16:0 and C18:0, respectively; and 7.22, 7.08 and 6.97 for C18:1, C18:2 and C18:3, respectively. It can be concluded that NBRs are seemed to be degraded more by the shorter chain length and unsaturated fatty acid esters.