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Non-covalent SDS adsorption at 2D-layered graphene nanoplatelet/epoxy interfaces: implications for dispersion and thermal/electrical transport in CFRP laminates
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DOI：10.1016/j.surfin.2026.109982.png)
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Abstract
En 中文
The interface between 2D-layered graphene nanoplatelets (GNP) and the surrounding epoxy matrix governs the multifunctional response of carbon fiber-reinforced polymer (CFRP) laminates. In this study, the effect of non-covalent surfactant-assisted dispersion of GNP on interfacial mechanisms and the associated thermal and electrical responses of CFRP composites was investigated. A vacuum-bagged MGS L285 epoxy laminating system was used as the matrix. Unlike covalent functionalization methods commonly reported in the literature, a non-covalent surfactant-assisted approach was adopted to preserve the intrinsic sp² conjugation of the 2D graphene basal plane. Modified graphene nanoplatelets (m-GNP) prepared using sodium dodecyl sulfate (SDS) were incorporated into the epoxy matrix at 0, 0.5, 1, and 1.5 wt%. Interfacial, microstructural, thermal, and electrical characterization was performed using SEM, FT-IR, UV-Vis, DSC/TGA, and impedance spectroscopy. The results showed that 1 wt% m-GNP provided the most balanced composition in terms of dispersion quality and interfacial homogeneity. DSC results showed that the glass transition temperature (Tg) increased from 64.66°C in the unmodified composite to 65.50, 65.73, and 67.32°C for 0.5, 1, and 1.5 wt% m-GNP, respectively. Electrical conductivity increased with m-GNP content, reaching 0.016 S/cm at 1.5 wt%. Overall, non-covalent surfactant adsorption emerges as an effective interfacial design strategy for 2D-nanofiller/polymer composite systems in which the filler's intrinsic sp² conjugation must be preserved.
Keywords:
2D graphene nanoplatelets
CFRP laminates
Non-covalent adsorption
SDS surfactant dispersion
GNP/epoxy interface
Thermal/electrical transport
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6.3
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2.4W
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