ABSTRACT In this work, short carbon fibers were first surface-grafted with various amounts of epoxy terminated hyperbranched polymers, and then utilized as reinforcing phases in various thermosetting polymeric blends composed of dicyanate ester of bisphenol-A (DCBA) and bisphenol-A based benzoxazine (BA-a) resins. The Fourier Transform Infrared Spectroscopy (FTIR) test validated the surface modification of the short fibers and confirmed the reaction between the coated fibers and the DCBA/BA-a resin blend. The composites’ mechanical properties were evaluated and the obtained results revealed that at the maximum fiber loadings, the bending strength and modulus as well as the impact strength were identified to be 217.8 MPa, 7.1 GPa, and 18.4 kJ/m2, respectively. The scanning electron microscope (SEM) analysis established that the enhancements were basically attributed to the good dispersion and adhesion of the coated carbon fibers within the resin matrix. Graphical Abstract

中文翻译：

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超支化聚合物包覆碳纤维增强DCBA/BA-a复合材料的结构、形态和机械性能

摘要在这项工作中，短碳纤维首先表面接枝了不同数量的环氧基超支化聚合物，然后在由双酚 A 的二氰酸酯 (DCBA) 和双酚 A 基苯并恶嗪组成的各种热固性聚合物共混物中用作增强相(BA-a) 树脂。傅里叶变换红外光谱 (FTIR) 测试验证了短纤维的表面改性，并确认了涂层纤维与 DCBA/BA-a 树脂混合物之间的反应。对复合材料的机械性能进行了评估，所得结果表明，在最大纤维负载下，弯曲强度和模量以及冲击强度分别为 217.8 MPa、7.1 GPa 和 18.4 kJ/m2。扫描电子显微镜 (SEM) 分析表明，增强主要归因于涂覆碳纤维在树脂基体中的良好分散性和粘附性。图形概要