Surface functionalization of polyethylene (PE) fibers with polydopamine (PDA) enhances the interfacial performance between fibers and cementitious matrices, influencing the efficiency of fiber reinforcements in cementitious composites. However, typical PDA modification requires a long treatment duration which is a major hurdle for practical applications. This paper introduces a facile strategy to rapidly modify PE fibers with dopamine (DA) by adding sodium periodate (SP) as an oxidizing agent. PE fibers were DA-modified with varied SP concentration and modification time; their surface properties were analyzed by environmental scanning electron microscopy (ESEM), atomic force microscopy (AFM), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and zeta potential measurements (ZP). The tensile strength and modulus of elasticity of the PE fibers were enhanced by 28 % and 40 %, respectively, through fast PDA modification. Micromechanical studies of the fibers embedded in cement depicted a considerable improvement in maximum pullout load, interfacial shear strength and pullout energy by the fiber functionalization. These improved properties can be ascribed to an increase in surface roughness, proved by AFM and ESEM, as well as a chemical activation of the PE fiber surface, demonstrated by XPS and ZP. Hence, the research findings provide an effective fast technique to functionalize PE fibers by PDA coating to achieve a stronger bond at the fiber/matrix interface, leading to an optimized fiber-reinforcing effect in cementitious composites.

中文翻译：

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高碘酸钠促进聚多巴胺改性聚乙烯纤维对水泥基复合材料中纤维-基体粘合的影响


聚乙烯（PE）纤维与聚多巴胺（PDA）的表面功能化增强了纤维与水泥基体之间的界面性能，影响水泥基复合材料中纤维增强材料的效率。然而，典型的PDA修饰需要较长的治疗时间，这是实际应用的主要障碍。本文介绍了一种简单的策略，通过添加高碘酸钠（SP）作为氧化剂，用多巴胺（DA）快速改性聚乙烯纤维。 PE纤维采用不同的SP浓度和改性时间进行DA改性；通过环境扫描电子显微镜 (ESEM)、原子力显微镜 (AFM)、热重分析 (TGA)、X 射线光电子能谱 (XPS) 和 zeta 电位测量 (ZP) 分析它们的表面特性。通过快速PDA改性，PE纤维的拉伸强度和弹性模量分别提高了28%和40%。对嵌入水泥中的纤维的微观力学研究表明，纤维功能化在最大拉拔载荷、界面剪切强度和拉拔能方面有相当大的改善。这些改进的性能可归因于表面粗糙度的增加（AFM 和 ESEM 证明），以及 PE 纤维表面的化学活化（XPS 和 ZP 证明）。因此，研究结果提供了一种有效的快速技术，通过PDA涂层对PE纤维进行功能化，以在纤维/基体界面处实现更强的结合，从而在水泥基复合材料中实现优化的纤维增强效果。