Compounding polyketone (PK) with carbon fibers (CFs) can provide composites that exhibit excellent properties. However, the thermal stability of PK itself is poor, limiting practical applications at high temperatures. Herein, a novel process is proposed to improve the thermal stability of PK-based carbon fiber-reinforced polymers (CFRPs). The plasma-assisted mechanochemistry (PMC) process creates mechanochemical bonds between materials under dry conditions, reducing polymer chain mobility at high temperatures and increasing the stiffness. Compared with conventional PK-based CFRPs, PMC-processed CFRPs have significantly higher glass transition temperatures and storage modulus, resulting in improved thermal stability. The tensile strength remained >90% after annealing at 150 °C for 1000 h. Moreover, despite repeated thermal hysteresis, the recycled PK-based CFRPs showed tensile strength, Young's modulus, and elongation at break that were >90% of initial values. This work provides a feasible and ecofriendly strategy to expand the applications and promote repeated recycling of PK-based CFRPs.

将聚酮（PK）与碳纤维（CFs）混合可以提供具有优异性能的复合材料。然而，PK本身的热稳定性差，限制了高温下的实际应用。在此，提出了一种新颖的方法来改善PK基碳纤维增强聚合物（CFRP）的热稳定性。等离子体辅助机械化学（PMC）工艺在干燥条件下在材料之间产生机械化学键，从而降低了高温下聚合物链的移动性并提高了硬度。与传统的基于PK的CFRP相比，PMC处理的CFRP具有明显更高的玻璃化转变温度和储能模量，从而提高了热稳定性。在150°C退火1000小时后，拉伸强度保持> 90％。此外，尽管反复出现热滞现象，回收的基于PK的CFRP的拉伸强度，杨氏模量和断裂伸长率大于初始值的90％。这项工作为扩大应用范围和促进基于PK的CFRP的重复利用提供了一种可行且环保的策略。