Due to poor wettability and low reactivity, the interfacial adhesions between CF and PEEK matrix are relatively weak, significantly affecting mechanical performances of composites, especially the interlaminar shear strength. This study focuses on improvement of fiber-matrix interfacial interactions for CF/PEEK composites via introducing interfacial layers of polyertherketoneketone (PEKK) on activated CF. This method takes advantage of hydrogen bond between PEKK and activated CF, as well as good compatibility between PEKK and PEEK. As a result, interlaminar shear strength, flexural strength and modulus of CF/PEEK composites increased by 70%, 37% and 48%, respectively. SEM observations on fractured surfaces of composites indicated that dominant failure mechanisms shifted from fiber-matrix debonding to deformation of interfacial layers and breakage in resin. This modification method is easy to handle and can be applied to produce large size of composite materials containing continuous CF or CF fabrics, showing potentials in industrial applications.

由于差的润湿性和低反应性，CF和PEEK基体之间的界面粘合性相对较弱，从而显着影响了复合材料的机械性能，尤其是层间剪切强度。这项研究的重点是通过在活化CF上引入聚醚酮酮（PEKK）的界面层来改善CF / PEEK复合材料的纤维-基质界面相互作用。该方法利用了PEKK与活化CF之间的氢键以及PEKK与PEEK之间的良好相容性。结果，CF / PEEK复合材料的层间剪切强度，弯曲强度和模量分别增加了70％，37％和48％。SEM对复合材料断裂表面的观察表明，主要的破坏机理从纤维基体的脱胶转变为界面层的变形和树脂的断裂。这种改性方法易于处理，可用于生产包含连续CF或CF织物的大尺寸复合材料，在工业应用中显示出潜力。