Poly(p-phenylene benzobisoxazole) fiber: properties, applications, and advances in surface modification for improved interfacial and UV resistance

Poly (p-phenylene benzobisoxazole) (PBO) fibers have drawn considerable research interest owing to their exceptional physicochemical properties, which confer broad potential as reinforcement materials across diverse applications. However, the widespread adoption of PBO fibers and their composites is significantly hindered by challenges such as surface chemical inertness and inadequate UV resistance. In response, extensive research efforts have been directed toward addressing these limitations. Therefore, this review systematically summarizes recent strategies for enhancing the surface and interfacial characteristics of PBO fibers, with a focus on improving interfacial adhesion and UV durability. Additionally, potential application domains for PBO fibers are explored and discussed. Finally, future challenges in the development of PBO are outlined, aiming to provide new perspectives for designing next-generation advanced functional PBO materials and to facilitate the industrial progress of high-performance PBO and its composites.