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采用端异氰酸基聚醚(ITPs)与环氧树脂反应,合成了含有柔性侧链的改性环氧树脂,研究了不同含量ITPs增韧环氧树脂在室温和低温(-60℃)下的冲击韧性和断裂韧性,探讨了增韧对室温和低温力学性能的影响,分析了其低温动态热机械(DMA)曲线并用扫描电镜(SEM)对断口形貌进行了观察。结果表明:低温下,改性环氧树脂在ITPs含量为10%时冲击韧性最好,为18.72 kJ/m2,比纯环氧树脂增加了51.9%,较室温下增韧提高的34.1%效果更为显著,而且弯曲强度和拉伸强度基本保持不变。
The modified epoxy resins with flexible side chains were synthesized by the reaction of isocyanato-based polyethers (ITPs) with epoxy resins. The toughened epoxy resins with different contents of ITPs were studied at room temperature and low temperature (-60 ℃) The impact toughness and fracture toughness of toughening toughening were studied. The effects of toughening on the mechanical properties at room temperature and low temperature were discussed. The low temperature dynamic thermomechanical (DMA) curves were analyzed and the fracture morphology was observed by scanning electron microscopy (SEM). The results showed that the impact toughness of modified epoxy resin was the best at 18.72 kJ / m2 with the ITPs content of 10% at low temperature, which was 51.9% more than the pure epoxy resin and more effective than the 34.1% toughening at room temperature Is significant, and the bending strength and tensile strength remain basically unchanged.