研究了一种刚性和柔性胺混合型固化剂(芳香胺DETD和聚醚胺D-400)固化环氧树脂浇铸体的力学性能、材料断裂表面的微观形貌和玻璃化转变温度等性能.结果表明:当D-400加入量占固化剂总量的40%时,其室温拉伸强度呈现最大值,为82.52 MPa,弹性模量为2.30 GPa,与未加D-400的体系相比分别提高了6.3%和14.4%,其低温冲击强度提高了14%.对冲击断面形貌进行扫描电子显微分析表明:D-400的加入致使断口形貌变得粗糙,抗开裂能力得到提高.热分析实验结果显示,体系的玻璃化转变温度随着D-400含量的增加而降低.此外,还探讨了环氧树脂体系低温增韧机制.
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