Abstract Grafting modification is an effective means to improve the interfacial bonding properties of fibre composites. In this study, a series of grafted poly(p-phenylene benzobisoxazole)-polyurethane (PBO-PU) fibres were fabricated using online continuous air plasma treatment. The resulting PBO-PU fibres were characterised using attenuated total reflection Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscopy. The results of interlaminar shear strength (ILSS) tests show that all the PBO-PU fibre reinforced epoxy resin composites exhibited superior interfacial adhesion properties compared with the untreated composites, and the ILSS reached 48.0 MPa, indicating an improvement of 99.49 %. Our findings demonstrate that plasma grafting provides the possibility to realise industrial production of PBO/epoxy composites exhibiting high interlaminar shear strengths.

中文翻译：

---

聚氨酯在线连续等离子体接枝改善PBO/环氧树脂复合材料的界面性能

摘要 接枝改性是提高纤维复合材料界面结合性能的有效手段。在这项研究中，使用在线连续空气等离子体处理制造了一系列接枝聚（对亚苯基苯并双恶唑）-聚氨酯（PBO-PU）纤维。使用衰减全反射傅里叶变换红外光谱、X 射线光电子能谱和扫描电子显微镜对所得 PBO-PU 纤维进行表征。层间剪切强度（ILSS）测试结果表明，与未经处理的复合材料相比，所有PBO-PU纤维增强环氧树脂复合材料均表现出优异的界面粘合性能，ILSS达到48.0 MPa，提高了99.49%。