It is important to prepare self-lubricating polymers with low friction coefficient and wear rate. Herein, poly(p-phenylene-2,6-benzobisoxazole) fibers coated with polydopamine (PBO@PDA) were synthesized and introduced to enhance the tribological performances of the UHMWPE composites. The PBO@PDA, with a rough surface and a PDA layer of 13 nm thickness, exhibited a robust interfacial interaction with the UHMWPE matrix. The thermal stability of the UHMWPE composites steadily improved with the increasing content of PBO@PDA due to the enhanced thermal stability and char-forming ability of PBO@PDA. In addition, the presence of PBO@PDA also enhanced the rigidity and crystallinity of the UHMWPE composites. The UHMWPE composite containing 2 wt% PBO@PDA exhibited the best tribological performance with a friction coefficient of 0.042 and a wear rate of 2.38 × 10-5 mm3/N·m, which were maximally reduced by 76 % and 32 %, respectively, as compared with those of pure UHMWPE. The addition of PBO@PDA increases the hardness of the UHMWPE composites, thereby improving their wear resistance. Furthermore, the incorporation of PBO@PDA contributes to the formation of lubricating films. However, the high content of PBO@PDA can lead to aggregation, which deteriorates friction performance. This work offers a feasible approach to reducing the friction and wear on UHMWPE lubricated materials.

中文翻译：

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受贻贝启发的聚多巴胺功能化 PBO 纤维作为 UHMWPE 复合材料的高效添加剂，具有更好的摩擦学性能


制备具有低摩擦系数和磨损率的自润滑聚合物非常重要。本文合成并引入涂有聚多巴胺 （PBO@PDA） 的聚（对苯基-2,6-苯并并异噁唑）纤维，以增强 UHMWPE 复合材料的摩擦学性能。该PBO@PDA具有粗糙的表面和 13 nm 厚的 PDA 层，与 UHMWPE 基体表现出强大的界面相互作用。由于PBO@PDA的热稳定性和成炭能力增强，随着 PBO@PDA 含量的增加，UHMWPE 复合材料的热稳定性稳步提高。此外，PBO@PDA的存在还增强了 UHMWPE 复合材料的刚度和结晶度。PBO@PDA含量为2 wt%的UHMWPE复合材料表现出最佳的摩擦学性能，摩擦系数为0.042，磨损率为2.38 × 10-5 mm3/N·m，与纯UHMWPE相比，分别最大降低了76 %和32 %。PBO@PDA的添加增加了 UHMWPE 复合材料的硬度，从而提高了它们的耐磨性。此外，PBO@PDA的掺入有助于润滑膜的形成。然而，高含量的 PBO@PDA 会导致聚集，从而恶化摩擦性能。这项工作为减少 UHMWPE 润滑材料的摩擦和磨损提供了一种可行的方法。