| 초록 |
New linear polyurethane was synthesized via a Diels–Alder (DA) reaction between a polyurethane prepolymer chain extended with triamine to make trifunctional groups. And then end-capped with furan groups and bismaleimide is added. The structure of the linear polyurethane with DA bonds was characterized by 1H NMR, ATI-FTIR and UV-vis. The introduction of DA bonds enables the polyurethane thermal reversibility, which was studied thoroughly by DSC and UV-vis. Besides, the new linear polyurethane with DA bonds also exhibits self-healing properties under heat treatment, which was observed by polarized optical microscope. The self-healing efficiency determined by the recovery of breaking tensile strength after being damaged and healed. |
