Synthesis and Characterization of Rigid Polyurethane Foam from Palm Oil-Derived Oleic Acid Polyol via Open Molding Process
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Oleic acid derived from palm oil contains a carbon–carbon double bond that can be converted into a polyol through epoxidation and hydroxylation, making it a promising renewable feedstock for rigid polyurethane foam. Polyurethane was synthesized by an open molding process, varying toluene diisocyanate (TDI) and polyethylene glycol (PEG-400) volumes from 10 to 30 mL each. The resulting polyol was a clear, pale-yellow liquid with a density of 0.9363 g/cm³, a viscosity of 14.03 cSt, a pH of 5.22, an acid value of 174.8 mg KOH/g and a hydroxyl value of 180.7 mg KOH/g. Increasing TDI volume decreased foam density due to exothermic CO? generation but increased compressive strength through higher crosslink density, whereas increasing PEG-400 linearly increased density but lowered compressive strength at high TDI levels, as PEG-400 acts as a soft-segment former. The optimum formulation, satisfying ASTM F1839 Grade 5, was Polyol : TDI : PEG-400 = 10 : 30 : 15 mL, giving a density of 0.0743 g/cm³ and a compressive strength of 0.7089 MPa. SEM showed a predominantly closed-cell structure, and FTIR confirmed urethane-bond formation (N–H, C=O, C–O). These results show that palm-oil-derived oleic acid is a feasible renewable feedstock for bio-based rigid polyurethane foam, supporting SDG 9 (Industry, Innovation and Infrastructure), SDG 12 (Responsible Consumption and Production) and SDG 13 (Climate Action).
Contribution to Sustainable Development Goals (SDGs):
SDG 9 : Industry, Innovation, and Infrastructure
SDG 12: Responsible Consumption and Production
SDG 13: Climate Action
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