| 초록 |
The unsaturated vegetable oils were functionalized by epoxidation as well as ring-opening for the formation of vegetable oils-based polyols (VOPs). These VPOs with the secondary hydroxyl groups were used as initiators for polymerization reaction of propylene oxide in the presence of the double metal cyanide catalyst. The effect of different hydroxyl value and concentration of VOPs on initiation time, molecular weight, polydispersion index, hydroxyl value and thermal properties of novel polyols was determined. The synthesized polyols were effectively used for the synthesis of polyurethanes with methylene diphenyl diisocyanate. The functional group of polyurethanes was identified through FT-IR spectroscopies. The thermal and mechanical properties of these polyurethanes were measured by using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), shore hardness and tensile tests. |
