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<p>Natural fibre composites, rich in cellulose, are cheaper and greener than synthetic composites, increasing their appeal. However, these composites often exhibit poor mechanical and interfacial characteristics. To enhance interfacial bonding and mechanical properties, we coat natural flax fibres, which have a high cellulose content, with reduced graphene oxide (rGO). Graphene-based nanomaterials improved interfacial shear strength by 184.94% and tensile strength by 81.14% in untreated flax fibres. The enhancement is attributed to the improved mechanical interlocking between the cellulose-rich fibres and graphene-based flakes, along with the roughening of the fibre surface. Field emission scanning electron microscopy (FE-SEM) and X-ray photoelectron spectroscopy (XPS) examined the structure and morphology of rGO-coated fibres. The findings were further quantified using Thermogravimetric Analysis (TGA). A water absorption study revealed that the rGO coating enhanced the moisture resistance of the cellulose-based flax fibres. Untreated flax/epoxy composites exhibited 13.7 and 64% lower tensile and flexural strengths, respectively, compared to rGO-modified composites. Moreover, composites reinforced with 1&#xa0;wt% rGO-coated cellulose-rich fibres showed a 44% reduction in moisture diffusion. The results suggest that eco-friendly, coated cellulose-based flax fibre composites could serve as sustainable alternatives to synthetic fibre composites in industrial applications.</p>

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Enhanced mechanical, interfacial, and moisture resistance properties of cellulose rich flax fibre composites via reduced graphene oxide coating

  • 期刊论文

  • 发表日期：

    2026年1月24日

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  • Umang Dubey,
  • K. Panneerselvam

摘要

Natural fibre composites, rich in cellulose, are cheaper and greener than synthetic composites, increasing their appeal. However, these composites often exhibit poor mechanical and interfacial characteristics. To enhance interfacial bonding and mechanical properties, we coat natural flax fibres, which have a high cellulose content, with reduced graphene oxide (rGO). Graphene-based nanomaterials improved interfacial shear strength by 184.94% and tensile strength by 81.14% in untreated flax fibres. The enhancement is attributed to the improved mechanical interlocking between the cellulose-rich fibres and graphene-based flakes, along with the roughening of the fibre surface. Field emission scanning electron microscopy (FE-SEM) and X-ray photoelectron spectroscopy (XPS) examined the structure and morphology of rGO-coated fibres. The findings were further quantified using Thermogravimetric Analysis (TGA). A water absorption study revealed that the rGO coating enhanced the moisture resistance of the cellulose-based flax fibres. Untreated flax/epoxy composites exhibited 13.7 and 64% lower tensile and flexural strengths, respectively, compared to rGO-modified composites. Moreover, composites reinforced with 1 wt% rGO-coated cellulose-rich fibres showed a 44% reduction in moisture diffusion. The results suggest that eco-friendly, coated cellulose-based flax fibre composites could serve as sustainable alternatives to synthetic fibre composites in industrial applications.