For lightweight applications, the interfacial bonding reliability determines the service life of Ti–6Al–4V titanium alloy (TC4)/carbon fiber reinforced thermoplastic (CFRTP) joints. Traditional joining methods limit their applications. In this study, a functional Schiff base-contained polymer was successfully synthesized to modify the TC4 surface. The results indicated the directionally induced high-density complexation between the synthesized Schiff base and the titanium atom from the TC4 sheet and the secondary interaction between the synthesized Schiff base-contained polymer and CFRTP matrix occurred, which improved the bonding reliability of the TC4/CFRTP joint. The combination of the high-density secondary interaction and synergistic effect between the functional groups enhanced the interfacial bonding strength by 287 % to 38.73 MPa. This was remarkably higher than the bonding strength improved by 46 % to 14.64 MPa via the introduction of micromolecule Schiff base that consists of same functional groups. The significant enhancement of the interfacial bonding reliability was thus achieved. These results were beneficial to future research to improve the reliability of metal-CFRTP hybrid joints.

中文翻译：

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通过功能性席夫碱聚合物定向诱导高密度二次相互作用提高钛合金与 CFRTP 的粘合可靠性

对于轻量化应用，界面粘合可靠性决定了Ti-6Al-4V钛合金（TC4）/碳纤维增强热塑性塑料（CFRTP）接头的使用寿命。传统的连接方法限制了它们的应用。在本研究中，成功​​合成了一种功能性席夫碱聚合物来修饰 TC4 表面。结果表明，合成的席夫碱与TC4片材中的钛原子之间发生定向诱导高密度络合作用，并且合成的席夫碱聚合物与CFRTP基体之间发生二次相互作用，从而提高了TC4/CFRTP的粘合可靠性。联合的。官能团之间的高密度二次相互作用和协同效应相结合，使界面结合强度提高了287%，达到38.73 MPa。这明显高于通过引入由相同官能团组成的小分子席夫碱而将粘合强度提高了46%至14.64 MPa。从而实现了界面结合可靠性的显着提高。这些结果对未来提高金属-CFRTP混合接头可靠性的研究有益。