Bio-Based Polyols from Seed Oils for Water-Blown Rigid Polyurethane Foam Preparation

Table 3

Physicochemical properties of modified seed oils.

Types	Properties	Sesame seed oil	Pumpkin seed oil
Unmodified	Color (visual)	Light blown	Dark green
	Viscosity (at 25°C, cP)	136 ± 3	160 ± 6
	Acid value (mg KOH/g)	7.23 ± 0.18	2.13 ± 0.14
	Water content (wt%)	0.08	0.09
Hydroxylation	Color (visual)	Brown	Dark green
	Viscosity (at 25°C, cP)	7302 ± 19	6722 ± 19
	OH number (mg KOH/g)	85.64 ± 0.91	84.25 ± 1.04
	Acid value (mg KOH/g)	16.30 ± 0.18	10.27 ± 0.16
	Water content (wt%)	0.38	0.80
Alcoholysis	Color (visual)	Brown	Dark green
	Viscosity (at 25°C, cP)	11278 ± 29	9862 ± 47
	OH number (mg KOH/g)	351.03 ± 3.84	340.24 ± 6.80
	Acid value (mg KOH/g)	10.29 ± 0.21	5.37 ± 0.19
	Water content (wt%)	0.53	0.83