Abstract A simple and efficient technique was proposed to yield hyperbranched polyimidazole (HBM) on carbon fiber (CF) surface using isophorone diisocyanate (IPDI) and imidazole (MZ) as monomers. The introduced HBM dendrimers dramatically ameliorated the polar groups, roughness and wettability on the fiber surface. The mechanical performances (interfacial shear, interlaminar shear and impact strength) of CF-HBM/epoxy composite were significantly improved by 78.7%, 41.1% and 43.4% compared with untreated CF composites, respectively. Furthermore, this in-situ polymerization process on CF surface could be conducive to improve the single fiber tensile strength, the interface failure behavior and reinforcing mechanism were also explored. This work furnishes a simple and efficient strategy to construct an interface layer with strong chemical interaction and high physical entanglement through in-situ synthesis, which would provide enormous potential in preparing high-performing structural composites.

中文翻译：

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超支化聚咪唑原位亲核加成改性碳纤维增强环氧树脂复合材料的界面性能

摘要 提出了一种以异佛尔酮二异氰酸酯（IPDI）和咪唑（MZ）为单体在碳纤维（CF）表面制备超支化聚咪唑（HBM）的简单有效的技术。引入的 HBM 树枝状聚合物显着改善了纤维表面的极性基团、粗糙度和润湿性。与未经处理的CF复合材料相比，CF-HBM/环氧树脂复合材料的力学性能（界面剪切、层间剪切和冲击强度）分别显着提高了78.7%、41.1%和43.4%。此外，这种在CF表面的原位聚合过程有利于提高单纤维的拉伸强度，还探索了界面破坏行为和增强机制。