Abstract The attainment of both strength and toughness was crucial for polymer composites. However, compared with the long fiber composites, conventional short fiber composites showed the low strength and toughness, due to the more stress concentrations generated around the fiber ends. In this work, a new morphological short carbon fiber reinforcement was fabricated by electrodeposition, which presented like the dendritic structure. The enhanced strength and toughness were realized by incorporating the dendritic short carbon fibers into rigid polyurethane (RPU) matrix. The tensile strength, impact strength and interfacial shear strength (ILSS) of the dendritic short carbon fibers/RPU composites were increased by 41.3%, 81.2% and 28.9%, respectively compared with pure RPU. The composites also exhibited the excellent dynamic mechanical properties. The satisfactory performance was mainly attributed to the pinning effect by the dendritic structure.

中文翻译：

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树枝状短碳纤维对硬质聚氨酯复合材料的增强作用

摘要 聚合物复合材料的强度和韧性的同时达到是至关重要的。然而，与长纤维复合材料相比，传统的短纤维复合材料由于在纤维端部产生更多的应力集中而表现出较低的强度和韧性。在这项工作中，通过电沉积制备了一种新的形态短碳纤维增强材料，其呈现类似树枝状结构。通过将树枝状短碳纤维掺入硬质聚氨酯 (RPU) 基体中，实现了增强的强度和韧性。与纯RPU相比，树枝状短碳纤维/RPU复合材料的拉伸强度、冲击强度和界面剪切强度（ILSS）分别提高了41.3%、81.2%和28.9%。该复合材料还表现出优异的动态力学性能。