Improving the dissatisfactory interfacial adhesion of carbon fiber (CF)/polyether-ether-ketone (PEEK) composites in some specific conditions is an extremely urgent demand. In this work, a series of soluble phenolphthalein polyaryl-ether-ketone polymers with different carboxyl contents (PEKC-COOH) were synthesized and employed to prepare water-based sizing agents. PEKC-COOH showed high solubility and excellent thermal properties, with over 239.5 °C of T_g value, which were much higher than that of PEEK (148.4 °C). The sizing agents exhibit good storage stability with particle sizes between 60.6 and 75.0 nm. Compared to unsized CF/PEEK composites, the bending strength and interlaminar shear strength of the CF-5/PEEK composites were enhanced by 52.9% and 53.3%, respectively. An illustrative mechanism for the interfacial reinforcement effect of the sizing agent was proposed accordingly. The protocol provides an effective and green method towards water-based sizing agent for enhancing the interfacial properties of CF/PEEK composites.

改善碳纤维（CF）/聚醚醚酮（PEEK）复合材料在某些特定条件下不令人满意的界面附着力是一个极其迫切的需求。在这项工作中，合成了一系列具有不同羧基含量的可溶性酚酞聚芳醚酮聚合物 (PEKC-COOH) 并用于制备水性施胶剂。PEKC-COOH 显示出高溶解度和优异的热性能，T _g超过 239.5 °C值，远高于 PEEK (148.4 °C)。施胶剂表现出良好的储存稳定性，粒径在 60.6 至 75.0 nm 之间。CF-5/PEEK 复合材料的弯曲强度和层间剪切强度与未定尺寸的 CF/PEEK 复合材料相比分别提高了 52.9% 和 53.3%。相应地提出了施胶剂界面增强作用的说明性机制。该协议为水基施胶剂提供了一种有效和绿色的方法，用于增强 CF/PEEK 复合材料的界面性能。