| 초록 |
Polyurethane (PU) is a thermoset polymer with various applications. However, traditional PUs are linear chains whose properties need to be further enhanced to accommodate increasing demand for applications. In this study, in order to improve mechanical properties of PUs, glycidyl azide polymer (GAP) was simultaneously cured through polyurethane reaction of hydroxyl groups in GAP with isophorone diisocyanate (IPDI) and “click reaction” of azide groups in GAP with alkyne in PPG-based crosslinkers to form polyurethane networks. The PPG-based cross-linkers were synthesized with propargyl 3-carboxylic-propanoate(PCPA) and series of poly(propylene glycol) (PPG)(Mn=76, 425, 1000 g/mol). Chemical structures of PCPA and PPG-based crosslinkers were characterized by 1H NMR, 13C NMR, and GC. Tensile strength, elongation strength and modulus were measured to evaluate mechanical properties of PU networks. |
