IPN结构聚氨酯改性环氧树脂的性能研究

The Properties of Epoxy Resin Modified by IPN Structure Polyurethane

采用同步互穿聚合物网络技术制备了聚氨酯改性TDE-85/Me THPA环氧树脂体系,比较了环氧树脂TDE-85/MeTHPA固化体系改性前后力学性能和热稳定性的差异。研究结果表明,加入适量的由不同分子量聚醚二元醇合成的聚氨酯预聚体,对TDE-85/MeTHPA固化体系的力学性能、热稳定性均有所增加;当聚醚二元醇分子量为1000,且合成的聚氨酯预聚体加入量为15%时,同未改性的固化体系相比,该改性体系的拉伸强度和冲击强度分别上升48.0%和115%,分别达到69.39 MPa和23.56 kJ/m2,同时,该改性材料的热稳定性也有较明显的提高,其失重1%的温度T1%为300℃,比未改性的固化体系失重1%的温度高了30℃。

TDE -85/MeTHPA epoxy resin was modified by polyurethane with the structure of interpenetrating poly- mers network （IPN）. The differences of modified system mechanical and thermal stability were discussed. The result indi- cated that the property percentage of polyurethane prepolymer（PUP） in TDE - 85/MeTHPA epoxy resin can improve me- chanical properties and thermal stability of the modified system, no matter how much the molecular weight of polypropyl- ene glycol（PPG） was. When the PPG molecular weight was 1000, and PUP was 15% , and the modified system mechani- cal property was very good. Its tensile strength was 69.39 MPa with increasing 48.0% , and its impact strength was 23.56 kJ/m2 with increasing 115%. At the seem time, thermal stability of the modified system was also good, and the tempera- ture of loss weight 1% was 300℃. Compared with the unmodified system, the temperature of loss weight 1% increased 30℃.