环氧树脂具有优良的热稳定性、电绝缘性能和物理、机械性能,但其固化后较脆、不耐冲击和容易应力开裂。本文提出在合成一种新型柔性环氧树脂固化剂,通过与环氧树脂固化反应后提高环氧树脂韧性的改性思路,达到提高环氧树脂韧性而不降低树脂固化物的强度和模量的目的。研究结果表明,当柔性固化剂的用量为质量百分含量在10%~15%之间时韧性达到最大。对于使用柔性固化剂固化环氧树脂,当柔性固化剂的用量为环氧树脂质量百分含量的10%时达到最大值,冲击韧性和断裂韧性分别比纯环氧树脂提高了33．3%和96．3%。柔性固化剂的用量为环氧树脂质量百分含量的10%时,在-50℃时冲击韧性大小为19．5 kJ·m-2,而此时纯环氧树脂的冲击韧性仅为7．96 kJ·m-2。
This paper presents the synthesis of a new type of flexible epoxy curing agent and an approach to im-prove the toughness of epoxy resin by curing without reducing the strength and modulus of the resin-cured material. The results show that the degree of toughness reaches maximum values when the flexible curing agent is applied at weight percentages( wt. %) between 10% and 15%. When the amount of flexible curing agent added to epoxy res-in weight is 10 wt. %,the impact toughness and fracture toughness increases by 33. 3% and 96. 3%,respectively, compared with the pure epoxy resin. When the amount of flexible curing agent added to epoxy is 10 wt. %,the re-sulting impact toughness of the material is 19. 5kJ·m-2 at -50℃,the impact toughness of pure epoxy resin is only 7. 96 kJ·m-2 .
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