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<p>In this study, cerium-phenol-amine modified boron nitride nanosheets were successfully synthesized via a facile polyethyleneimine-mediated mechanical exfoliation and in-situ supramolecular self-assembly strategy. This approach was designed to endow boron nitride nanosheets (BNNS) with enhanced physical barrier properties and pH-responsive active anticorrosion functionality. When incorporated into a waterborne epoxy (WEP) coating, the resulting CTP-BNNS composite exhibited exceptional long-term shielding performance and significant self-healing capabilities in damaged areas. UV–vis spectroscopy confirmed the acid-triggered release of cerium ions, highlighting the stimulus-responsive nature of the assembly. Electrochemical impedance spectroscopy (EIS) revealed that the low-frequency impedance modulus (|<i>Z</i>|<sub>0.01&#xa0;Hz</sub>) of the CTP-BNNS/WEP coating maintained a remarkable value of 4.00 × 10<sup>9</sup> Ω·cm<sup>2</sup> after 75 days of immersion in 3.5 wt% NaCl solution, which was much higher than that of pure WEP coating (6.50 × 10<sup>7</sup> Ω·cm<sup>2</sup>). Furthermore, molecular dynamics simulations indicated that the CTP-BNNS/WEP system possesses superior impermeability, characterized by significantly reduced fractional free volume and lower diffusion coefficients for O<sub>2</sub>, H<sub>2</sub>O and Cl<sup>−</sup>. The synergy between the inherent impermeability of 2D BNNS and the cerium-phenol-amine active system not only strengthens the interfacial adhesion between the filler and the resin matrix but also imparts a dual-functional “passive-active” protection mechanism. This work provides a robust strategy for engineering high-performance, long-term anticorrosive coatings through the functionalization of exfoliated 2D nanomaterials.</p>

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Polyethyleneimine-assisted supramolecular self-assembly of cerium-phenol-amine system on boron nitride surfaces for anticorrosive coatings with active pH responsive behavior and enhanced barrier performance

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月20日

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  • Peng Xu,
  • Tianguan Wang,
  • Xinwei Wang,
  • Xinyu Zhao,
  • Wenfeng Ge,
  • Jianda Chen,
  • Bo Zhang,
  • Guozhe Meng

摘要

In this study, cerium-phenol-amine modified boron nitride nanosheets were successfully synthesized via a facile polyethyleneimine-mediated mechanical exfoliation and in-situ supramolecular self-assembly strategy. This approach was designed to endow boron nitride nanosheets (BNNS) with enhanced physical barrier properties and pH-responsive active anticorrosion functionality. When incorporated into a waterborne epoxy (WEP) coating, the resulting CTP-BNNS composite exhibited exceptional long-term shielding performance and significant self-healing capabilities in damaged areas. UV–vis spectroscopy confirmed the acid-triggered release of cerium ions, highlighting the stimulus-responsive nature of the assembly. Electrochemical impedance spectroscopy (EIS) revealed that the low-frequency impedance modulus (|Z|0.01 Hz) of the CTP-BNNS/WEP coating maintained a remarkable value of 4.00 × 109 Ω·cm2 after 75 days of immersion in 3.5 wt% NaCl solution, which was much higher than that of pure WEP coating (6.50 × 107 Ω·cm2). Furthermore, molecular dynamics simulations indicated that the CTP-BNNS/WEP system possesses superior impermeability, characterized by significantly reduced fractional free volume and lower diffusion coefficients for O2, H2O and Cl−. The synergy between the inherent impermeability of 2D BNNS and the cerium-phenol-amine active system not only strengthens the interfacial adhesion between the filler and the resin matrix but also imparts a dual-functional “passive-active” protection mechanism. This work provides a robust strategy for engineering high-performance, long-term anticorrosive coatings through the functionalization of exfoliated 2D nanomaterials.