Crystalline poly ether ether ketone (PEEK) is an emergent effective sizing agent for carbon fiber (CF) for use in CF/PEEK composites. Soluble PEEK with the ability to recover crystallinity via simple acidification was synthesized and grafted on carbon nanotube for the first time to enhance the effectiveness and thermomechanical integrity of the based sizing, to achieve a higher level of chemical resistance and interfacial enhancement. CNT-filled, acidified-CNT-filled, and PEEK-grafted-CNT-filled sizing compounds were synthesized and coated on to CF. Proton nuclear magnetic resonance (¹H NMR) and Fourier-transform infrared (FTIR) spectroscopy were used to analyze the products of chemical synthesis, whereas X-ray photoelectron spectroscopy (XPS) was used to assess the grafting reaction. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) were used to assess the morphology of the unsized and sized CF, and a microbond test was used to evaluate the interfacial shear strength (IFSS) of the sizing. As a result, the CF/PEEK composites achieved the highest ever reported IFSS, with values of 101.4 MPa and 103.4 MPa in the acidified-CNT and PEEK-grafted-CNT samples, respectively. It is noted that the PEEK-grafted-CNT sample also exhibited greater solvent resistance due to closer interfacial distance, and an IFSS retention rate of 80%–90% in various polar and non-polar solvents. The successful application of nano-reinforcement in a CF interfacial sizing and the development of the PEEK grafting on CNT possesses an expanded application potential for CF/PEEK composites.

结晶聚醚醚酮 (PEEK) 是一种新兴的有效碳纤维 (CF) 上浆剂，用于 CF/PEEK 复合材料。首次合成了能够通过简单酸化恢复结晶度的可溶性 PEEK 并将其接枝到碳纳米管上，以提高基础施胶的有效性和热机械完整性，从而实现更高水平的耐化学性和界面增强。合成了 CNT 填充、酸化 CNT 填充和 PEEK 接枝 CNT 填充的上浆化合物，并将其涂覆到 CF 上。质子核磁共振 ( ¹H NMR) 和傅里叶变换红外 (FTIR) 光谱用于分析化学合成的产物，而 X 射线光电子能谱 (XPS) 用于评估接枝反应。原子力显微镜 (AFM) 和扫描电子显微镜 (SEM) 用于评估未上胶和上胶 CF 的形态，并使用微键测试评估上胶的界面剪切强度 (IFSS)。因此，CF/PEEK 复合材料达到了有史以来最高的 IFSS，在酸化 CNT 和 PEEK 接枝 CNT 样品中的值分别为 101.4 MPa 和 103.4 MPa。值得注意的是，由于界面距离更近，PEEK 接枝的 CNT 样品还表现出更强的耐溶剂性，并且在各种极性和非极性溶剂中的 IFSS 保留率为 80%–90%。