| v [cm3·mol−1] | The molar volume of ternary system component |
| δd [(MPa)1/2] | The dispersive component of solubility parameter |
| δh [(MPa)1/2] | The contribution due to hydrogen bonding |
| δp [(MPa)1/2] | Polar component of solubility parameter |
| δ [(MPa)1/2] | Total solubility parameter |
| χ13 | Nonsolvent/polymer interaction parameter |
| χ23 | Solvent/polymer interaction parameter |
| ∆δi–p | Solubility parameter difference |
| α | Ideal selectivity |
| Ra | Solubility parameter distance |
| Ro | Interaction radius of polymer solubility sphere |
| R | Universal gas constant |
| T | Absolute Temperature |
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