Conclusion
The presence of dispersants can efficiently enhance the solubility and dispersibility of polymeric PPDs in biodiesel blends, and the PPDCs of RMC-MB-NVP terpolymers combined with the dispersants presented better depressive effects than the single terpolymers. Among them, C16MC-MB-NVP (5:1:1) combined with FAPE 7 dispersant at 4:1 mass ratio (PPDC-FAPE 7) showed the best synergistic effect, and the CP, CFPP, and PP of B20 treated with 2000 ppm PPDC-FAPE 7 are decreased by 4, 10, and 19 °C, respectively.
POM showed that PPDCs have the property of inhibiting the aggregation of crystals, changing the crystal growth, and reducing the crystal size, which is beneficial for improving the low-temperature performance of fuel. The energy reduction of the solid–liquid phase transition can be observed by DSC analysis, and the viscosity is reduced at the same time. The results presented by the different approach indicated that B20 treated with PPDC-FAPE 7 significantly improves its cold flow properties.