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<p>Interlaminar delamination limits the damage tolerance of carbon-fiber laminates and remains challenging to quantify and mitigate using conventional thermoset matrices. Here, the Mode-I and Mode-II interlaminar fracture behavior of carbon-fiber/epoxy-polyimine laminates containing dynamic imine bonds was investigated using double-cantilever beam and end-notched flexure tests, with cohesive-zone simulations employed to assist interpretation. The polyimine used in this study is chemically distinct from polyimide, as it is based on reversible imine (C = N) bonds rather than permanent imide linkages. The laminates exhibit interlaminar fracture toughness values of 2.39&#xa0;kJ/m²in Mode-I and 6.03&#xa0;kJ/m²in Mode-II. The simulations show good agreement with the measured force-displacement responses and support the interpretation that the dynamic interface delays delamination growth. As an additional demonstration, partial property recovery is observed after hot-press treatment, indicating potential for maintainable laminate structures. Overall, the results provide experimental evidence and supporting modeling for improving delamination resistance in epoxy-based carbon-fiber laminates via dynamic imine bonding.</p>

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Interlaminar Fracture Toughness of Carbon Fiber/Epoxy–Polyimine Laminates With Dynamic Imine Bonds

  • 期刊论文

  • 发表日期：

    2026年8月1日

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  • Nuoyi Wu,
  • Chuanbo An,
  • Zhiying Sun,
  • Xu Li,
  • Fuying Zhao,
  • Xiaoxue Wang,
  • Yun Chen,
  • Si Zhang

摘要

Interlaminar delamination limits the damage tolerance of carbon-fiber laminates and remains challenging to quantify and mitigate using conventional thermoset matrices. Here, the Mode-I and Mode-II interlaminar fracture behavior of carbon-fiber/epoxy-polyimine laminates containing dynamic imine bonds was investigated using double-cantilever beam and end-notched flexure tests, with cohesive-zone simulations employed to assist interpretation. The polyimine used in this study is chemically distinct from polyimide, as it is based on reversible imine (C = N) bonds rather than permanent imide linkages. The laminates exhibit interlaminar fracture toughness values of 2.39 kJ/m²in Mode-I and 6.03 kJ/m²in Mode-II. The simulations show good agreement with the measured force-displacement responses and support the interpretation that the dynamic interface delays delamination growth. As an additional demonstration, partial property recovery is observed after hot-press treatment, indicating potential for maintainable laminate structures. Overall, the results provide experimental evidence and supporting modeling for improving delamination resistance in epoxy-based carbon-fiber laminates via dynamic imine bonding.