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<p>Regulating the interlaminar structure is an effective approach to tailoring the viscoelastic response of carbon fiber-reinforced polymer (CFRP) laminates. PEI/GnP@PEI nanofiber membranes prepared by electrospinning are embedded into CFRP laminates to modify the interlaminar region. The influence of membrane addition on interlayer microstructure is investigated, and the viscoelastic behavior of the main transition zone (MTZ) of the laminates with hybrid layup configuration is parameterized. Two quantitative indicators, the loss-modulus integral area (LMIA) and the full width at half maximum (FWHM) of the loss factor, are proposed to characterize energy-dissipation behavior and damping-response broadening of the laminates, respectively. A Williams–Landel–Ferry (WLF)-based dual-element viscoelastic model is established to describe the dynamic viscoelastic response within the MTZ. The correlation between the membrane microstructure and the MTZ-based quantitative indicators is analyzed. The results show that moderate GnP addition refines the PEI fibers, improves membrane coverage, and promotes a more uniform interlaminar network. Compared with CF/EP, the LMIA values of PEI-G0 and PEI-G1.5 increase by 64.1% and 86.3%, respectively. PEI-G2 shows a lower LMIA than PEI-G1.5, but it remains 68.5% higher than that of CF/EP. This work provides a basis for designing CFRP interleaves with improved stiffness retention and energy-dissipation behavior under dynamic thermal–mechanical conditions.</p> Graphical Abstract <p></p>

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Tailoring the Viscoelastic Response of CFRP Laminates with GnP@PEI Nanofiber Membranes

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Xuejuan Niu,
  • Weiping Huo,
  • Xiao Wang,
  • Yuancheng Xu,
  • Zheng Lin

摘要

Regulating the interlaminar structure is an effective approach to tailoring the viscoelastic response of carbon fiber-reinforced polymer (CFRP) laminates. PEI/GnP@PEI nanofiber membranes prepared by electrospinning are embedded into CFRP laminates to modify the interlaminar region. The influence of membrane addition on interlayer microstructure is investigated, and the viscoelastic behavior of the main transition zone (MTZ) of the laminates with hybrid layup configuration is parameterized. Two quantitative indicators, the loss-modulus integral area (LMIA) and the full width at half maximum (FWHM) of the loss factor, are proposed to characterize energy-dissipation behavior and damping-response broadening of the laminates, respectively. A Williams–Landel–Ferry (WLF)-based dual-element viscoelastic model is established to describe the dynamic viscoelastic response within the MTZ. The correlation between the membrane microstructure and the MTZ-based quantitative indicators is analyzed. The results show that moderate GnP addition refines the PEI fibers, improves membrane coverage, and promotes a more uniform interlaminar network. Compared with CF/EP, the LMIA values of PEI-G0 and PEI-G1.5 increase by 64.1% and 86.3%, respectively. PEI-G2 shows a lower LMIA than PEI-G1.5, but it remains 68.5% higher than that of CF/EP. This work provides a basis for designing CFRP interleaves with improved stiffness retention and energy-dissipation behavior under dynamic thermal–mechanical conditions.

Graphical Abstract