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Coir fiber (COIRF) reinforced glycidyl methacrylate (GMA) functionalized ethylene butyl acrylate (CF‐EBA) composites (COIRF/CF‐EBA) were processed by extrusion and injection molding. A good COIRF/CF‐EBA interfacial adhesion was indicated by Scanning Electron Microscopy (FE‐SEM). Fourier Transform Infra‐Red (FTIR) spectroscopy established this adhesion emerging from etherification and hydrogen bonding between the functional groups of CF‐EBA and of COIRF. The composites exhibited higher tensile properties than pristine CF‐EBA, and also exhibited increase in their tensile properties with increase in COIRF contents in them. The storage modulus and loss modulus of the composites also increased as the amount of COIRF in them increased, but the values of these properties decreased with increasing temperature. Thermal stability of the composites was observed to be intermediate between that of COIRF and CF‐EBA. Highlights: Coir Fiber/Chemically Functionalized Ethylene Butylene Acrylate Composites.CF‐EBA/COIRF bonding by etherification and hydrogen bonding between them.The COIRF/CF‐EBA composites show higher properties than their CF‐EBA matrix.30/70 COIRF/CF‐EBA composite showed the highest tensile strength (10.93 MPa).COIRF/CF‐EBA composite show thermal stability upto approx. 245°C. [ABSTRACT FROM AUTHOR]

The demand of natural fiber reinforced composites has grown enormously in polymer industries owing to their renewability and sustainability and maintaining their performance and properties. In this investigation, two natural fibers have been considered as a reinforcer to develop chemically functionalized high‐density polyethylene (CF‐HDPE)‐based composites. The total holocellulose content of ~85% and ~65% for nettle fiber (NTF) and oil palm empty fruit bunch fiber (OPF) make them significant for this study. OPF/CF‐HDPE and NTF/CF‐HDPE composites have been developed and characterized to measure their desirable properties. The structural confirmation suggests reinforcement/matrix adhesion through ester and hydrogen bonds between them. NTF/CF‐HDPE and OPF/CF‐HDPE are thermally stable upto 240°C and 250°C, respectively. A significant increment of ~40% and ~64% in tensile strength were observed in addition of OPF and NTF reinforcer in pristine matrix. A similar observation has been shown in flexural strength with improvement of ~58% and ~83% with OPF and NTF as reinforcer. Among all these composite compositions, the 30/70 NTF/CF‐HDPE composite demonstrated the highest tensile and flexural properties values due to higher holocellulose of NTF. This study demonstrates the potential of OPF and NTF reinforcer to develop natural fiber reinforced polymer composites, which helps respective industries to manufactured tailored made products with desirable properties. Highlights: OPF/CF‐HDPE and NTF/CF‐HDPE composites are sustainable and low cost.The composite compositions have been developed by extrusion and injection molding.The composite's mechanical (tensile and flexural) properties have been demonstrated.SEM and FTIR characterized the composites for the fiber/matrix adhesion.The composite's thermal stability has been affected by fibers and matrix. [ABSTRACT FROM AUTHOR]