Carbon fiber (CF) reinforced polyether ether ketone (PEEK) occupied an important position in composites due to its excellent properties. However, the weak interfacial strength became a bottleneck restricting the further development. In this work, water-based crosslinkable polyarylether sizing agent with different concentrations were prepared. These sizing agents have good storage stability, with particle sizes ranging from 54.6 nm to 78.5 nm. The chemical bonds formed by self-crosslinking reaction of nitrile groups during the hot-pressing process endowed the sizing agent with outstanding solvent resistance. In addition, the glass transition temperature of the crosslinked sizing agent was increased to 285.5 °C. The maximum bending strength and interlaminar shear strength of CF1.5/PEEK composites were 43.1% and 42.7% higher than unsized CF composites. Furthermore, it retained excellent mechanical properties after solvent treatment, owing to the construction of the solvent-resistant interphase. This “thermoplastic processing, thermosetting application” polyarylether sizing agent is expected to further expand the application range of CF/PEEK composites.

碳纤维（CF）增强聚醚醚酮（PEEK）以其优异的性能在复合材料中占有重要地位。然而，界面强度较弱成为制约其进一步发展的瓶颈。本工作制备了不同浓度的水性可交联聚芳醚施胶剂。这些施胶剂具有良好的储存稳定性，粒径范围从54.6 nm到78.5 nm。腈基在热压过程中发生自交联反应形成的化学键，使施胶剂具有优异的耐溶剂性。此外，交联施胶剂的玻璃化转变温度提高到285.5℃。CF1.5/PEEK复合材料的最大弯曲强度和层间剪切强度分别为43.1%和42。比未尺寸的 CF 复合材料高 7%。此外，由于耐溶剂界面的构造，它在溶剂处理后保持了优异的机械性能。这种“热塑性加工、热固性应用”的聚芳醚施胶剂有望进一步扩大CF/PEEK复合材料的应用范围。