<![CDATA[Polyurethane is a widely used polymer due to its excellent mechanical and thermal properties . This study aims to evaluate the effect of the polyol–isocyanate ratio and butanediol weight as a chain extender on the characteristics of polyurethane.Polyurethane was synthesized from oleic acid-based polyol and isocyanate using a step-growth polymerization method. Characterization was conducted using FTIR to identify functional groups, TGA to determine thermal stability, and SEM to observe surface morphology.FTIR results confirmed the formation of polyurethane through the presence of C=O, N–H, and C–O–C groups. TGA analysis showed good thermal stability with degradation temperatures ranging from 256.93°C to 548.25°C, consistent with typical polyurethane thermal behavior . SEM analysis indicated a relatively uniform surface morphology.Overall, variations in the polyol–isocyanate ratio and butanediol weight influenced the properties and thermal stability of the synthesized polyurethane. These results suggest that oleic acid-based polyurethane has potential as an environmentally friendly material for industrial applications. Keywords : Polyuretan, Oleic Acid-Based Polyol, Isocyanate, Butanediol, FTIR, TGA,SEM.]]>
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