Abstract In this work, low content of polyetherimide (PEI) and amino groups grafted MWCNTs (NH2-MWCNTs) were simultaneously employed in order to toughen epoxy resin without scarifying the thermal properties. The grafted NH2 groups on the surface of MWCNTs leads to outstanding dispersibility. The influence of PEI and NH2-MWCNTs on the epoxy resin including the curing behaviors, mechanical properties, phase structures, and thermal properties were investigated systematically. The NH2-MWCNTs/PEI/Epoxy ternary composites with 5 phr (parts per hundred of resin) PEI and 0.4 phr NH2-MWCNTs shows the maximum value of 73.1%improvement of the fracture toughness in term of KIC compared to that of neat epoxy. A prefer dispersion of NH2-MWCNTs with PEI microspheres was unambiguously detected from the detailed SEM phase structures, which is most likely associated with the dramatic improvement of the toughness. Thus, an interestingly synergistic toughening effect were obtained through coupling matrix crack bridging, deflection or plastic deformation of PEI microspheres and crack bridging or pulling out of carbon nanotubes. The glass transition temperature of ternary composite material with low content of PEI and NH2-MWCNTs was significantly increased, and the decomposition initial temperature of the ternary composite material did not sacrifice the thermal stability of the epoxy resin. In addition, the thermal stability of epoxy resin was also slightly improved by incorporation of low content of PEI and NH2-MWCNTs.

中文翻译：

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通过掺入聚醚酰亚胺和氨基接枝多壁碳纳米管协同增韧环氧树脂

摘要 在这项工作中，同时使用低含量的聚醚酰亚胺 (PEI) 和氨基接枝的多壁碳纳米管 (NH2-MWCNT) 来增韧环氧树脂而不破坏其热性能。MWCNTs 表面接枝的 NH2 基团导致出色的分散性。系统地研究了 PEI 和 NH2-MWCNTs 对环氧树脂的影响，包括固化行为、机械性能、相结构和热性能。NH2-MWCNTs/PEI/Epoxy 三元复合材料与 5 phr（每百份树脂的份数）PEI 和 0.4 phr NH2-MWCNTs 显示与纯环氧树脂相比，就 KIC 而言，断裂韧性提高了 73.1% 的最大值。从详细的 SEM 相结构中明确检测到 NH2-MWCNTs 与 PEI 微球的优选分散体，这很可能与韧性的显着提高有关。因此，通过耦合基体裂纹桥接、PEI 微球的偏转或塑性变形以及裂纹桥接或拉出碳纳米管，获得了有趣的协同增韧效果。PEI和NH2-MWCNTs含量低的三元复合材料的玻璃化转变温度显着提高，三元复合材料的分解起始温度没有牺牲环氧树脂的热稳定性。此外，通过掺入低含量的 PEI 和 NH2-MWCNTs，环氧树脂的热稳定性也略有提高。PEI 微球的偏转或塑性变形以及裂纹桥接或拉出碳纳米管。PEI和NH2-MWCNTs含量低的三元复合材料的玻璃化转变温度显着提高，三元复合材料的分解起始温度没有牺牲环氧树脂的热稳定性。此外，通过掺入低含量的 PEI 和 NH2-MWCNTs，环氧树脂的热稳定性也略有提高。PEI 微球的偏转或塑性变形以及裂纹桥接或拉出碳纳米管。PEI和NH2-MWCNTs含量低的三元复合材料的玻璃化转变温度显着提高，三元复合材料的分解起始温度没有牺牲环氧树脂的热稳定性。此外，通过掺入低含量的 PEI 和 NH2-MWCNTs，环氧树脂的热稳定性也略有提高。三元复合材料的分解起始温度并没有牺牲环氧树脂的热稳定性。此外，通过掺入低含量的 PEI 和 NH2-MWCNTs，环氧树脂的热稳定性也略有提高。三元复合材料的分解起始温度并没有牺牲环氧树脂的热稳定性。此外，通过掺入低含量的 PEI 和 NH2-MWCNTs，环氧树脂的热稳定性也略有提高。