The surface treatment of ultra-high molecular weight polyethylene (UHMWPE) fibers is one of the key technologies for the application of UHMWPE fibers composites. In this paper, the interface transition layer of polydopamine (PDA) and polyhedral oligomeric silsesquioxane (POSS) co-deposited on the surface of corona pre-treatment fiber fabric is used to the uniform and efficient distribution of loads between the fibers and the resin matrix, especially to significantly improve the flexural modulus of UHMWPE fiber fabric composites. Under 2.5 kW corona pre-treatment, 4 g/L of dopamine hydrochloride and 2 wt.% of γ-Aminopropyl triethoxysilane aqueous solution, the impact strength, flexural strength, and modulus of UH-C2.5@PDA/PA2 fiber fabric/epoxy composites are greatly improved to 218.6 kJ/m², 151.7 MPa, and 7.8 GPa, respectively, which are 72 %, 106 % and 143 % higher than those of the untreated UHMWPE fiber composites. It may be attributed to: (1) the corona pre-treatment of UHMWPE fiber induces larger amount of active sites on fiber surface and higher surface energy, leading to a better wettability and adhesion with the matrix resin; (2) the mechanical interlocking engagement between the fibers and nano-POSS particles effectively prevents fibers extraction from the matrix resin and increases the friction of relative sliding; (3) POSS can strengthen the transition layer. The failure of UHMWPE fiber reinforced composites can be mainly attributed to energy absorption of matrix resin fracture, interface damage and relative sliding between matrix resin and fibers, fiber yield deformation and fiber fracture.

中文翻译：

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通过共沉积在 UHMWPE 纤维表面建立新型 PDA/POSS 过渡层以改善复合材料的机械性能


超高分子量聚乙烯 （UHMWPE） 纤维的表面处理是 UHMWPE 纤维复合材料应用的关键技术之一。本文利用聚多巴胺 （PDA） 和多面体低聚倍半硅氧烷 （POSS） 共沉积在电晕预处理纤维织物表面的界面过渡层，使纤维与树脂基体之间的载荷均匀高效分布，特别是显著提高了 UHMWPE 纤维织物复合材料的弯曲模量。在 2.5 kW 电晕预处理下，4 g/L 盐酸多巴胺和 2 wt.% 的 γ-氨丙基三乙氧基硅烷水溶液，UH-C2.5@PDA/PA2 纤维织物/环氧树脂复合材料的冲击强度、弯曲强度和模量分别大幅提高至 218.6 kJ/m²、151.7 MPa 和 7.8 GPa，比未处理的 UHMWPE 纤维复合材料提高了 72 %、106 % 和 143 %。这可能归因于：（1） UHMWPE 纤维的电晕预处理在纤维表面诱导出更多的活性位点和更高的表面能，导致更好的润湿性和与基体树脂的粘附力;（2） 纤维与纳米 POSS 颗粒之间的机械互锁啮合有效阻止了纤维从基体树脂中萃取，并增加了相对滑动的摩擦力;（3） POSS 可以加强过渡层。UHMWPE 纤维增强复合材料的失效主要可归因于基体树脂断裂的能量吸收、基体树脂与纤维之间的界面损伤和相对滑动、纤维屈服变形和纤维断裂。