For good compatibility between a solvent and NBR, the difference
between the solubility parameters should be small. The calculated
results of Dd 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.
The Hansen solubility parameters of biodiesel fuels could be
calculated by Eq. (8) using the three solubility components: