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Abstract
ABSTRACT The proliferation of advanced electronic systems and wireless communication technologies has amplified the urgency for materials capable of mitigating electromagnetic interference (EMI). This investigation focuses on eco compatible polymer composites incorporating natural fibers derived from organic residues, specifically sugarcane bagasse and coconut coir, integrated into an epoxy matrix. The fabricated materials include epoxy-coconut coir (EPCD), epoxy-sugarcane bagasse (EPSD), and a metamaterials configuration comprising equal proportions of both fibers (EPSC40). The metamaterials formulation, featuring 20 wt% of each bio-fiber, demonstrated superior microwave attenuation properties with an effective bandwidth of 4.2 GHz across X-band frequency range, and minimum reflection loss of −12.49 dB at 10.5 GHz with conductivity recorded 0.17 Sm−1 at the same frequency. Mechanical evaluation indicated a significant enhancement in hardness (29.326 VHN) upon increasing the fiber content to 40 wt%, while alkali treatment of the fibers improved interfacial adhesion within the matrix, concurrently reducing water absorption to 0.54%. Furthermore, the material demonstrated a significant improvement in tensile strength, attaining a maximum value of 518.65 MPa. Thermal conductivity analysis indicated efficient thermal performance, with a value of 0.26 W/mK at 25°C, which progressively increased to 0.45 W/mK at 70°C which highlights the material suitability for applications requiring effective temperature regulation.
Published Version
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