Publication: Synthesis and characterization of palm kernel oil polyol based polyurethane elastomer as shape memory material
Date
2020-04-01
Authors
Saad, Norshahli Mat
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Abstract
Vegetable oil-based polyurethane shape memory (SMPU) has gained attention in advanced bio-based polymeric materials and its unique characteristic may assist their use in biomedical applications. The aim of this research was to synthesize palm kernel oil polyol (PKO-p) based polyurethane (PU) via two-step bulk polymerization process using 4,4-methylenebis (cyclohexyl isocyanate) (HMDI), polycaprolactone diol (PCL), PKO-p, 1,4-butanediol (BD) and dibutyltin dilaurate (DBTDL). The reaction time of prepolymerization was varied from 0.5 to 2.5 hours to determine the optimum time of the prepolymer. The effect of different molar ratio of PKO-p towards mechanical, thermal and shape memory properties of PU was investigated. The increase of crystalline structure and microphase separation has improved the shape fixity of PU (86%) and exhibited excellent shape recovery. Based on the overall results, the optimum reaction time was observed at 2.0 hours as it possessed a good tensile strength. Hence, the investigation of PU at a different molar ratio of PKO-p were carried out at 2.0 hours prepolymer time. It was found that PU with 10% PKO-p imparted higher tensile strength as compared to the other samples. On the other hand, the shape recovery of PU remains high at 40% PKO-p with 87% shape fixity and thermally stable. The results revealed the advantages of substituting PCL with PKO-p to minimize the usage of petroleum-based polyol and also displayed that the PKO-p based PU studied have the potential to be used as advanced shape memory materials.