| 초록 |
A series of thermoplastic polyurethane (TPU)s with architectures of different hard/soft block ratios were synthesized by solution polymerization based on 4,4’-methylenediphenyl diisocyanate (MDI), poly(tetrahydrofuran) (PTMG) (Mn ~ 250), and 1,4-butanediol (1,4-BD). Shape-memory and stress-strain studies were carried out to elucidate the structure-property relationships existing in these TPUs. The hydrogen bonding of hard block and the flexibility of soft block exhibited a positive effect on the mechanical and shape-memory properties. Thermal and mechanical properties of TPUs were studied by differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), and tensile testing. Morphological properties of TPUs studied on the shape-memory will be discussed. |
