Hemp fiber surface modification: Its effect on mechanical and tribological properties of hemp fiber reinforced epoxy composites

In this research work, the effects of sodium carbonate and hydrogen peroxide treatment of hemp fiber on the water absorption, mechanical, and tribological properties of hemp fiber reinforced epoxy composites (HFREC) were investigated. The change in surface roughness and fiber size after chemical treatment was confirmed by the scanning electron microscopy (SEM) images. Fourier transform infrared analysis confirmed the removal of hemicellulose and lignin content of the fiber after both the chemical treatment. X-ray diffraction analysis showed an increase in the crystallinity index of the chemically treated fiber. The experimental results also revealed that both sodium carbonate and peroxide modification have resulted in enhancement of water resistance and mechanical properties such as tensile strength and tensile modulus and reduction in impact properties of treated HFREC. Tribological test results revealed that the treated HFREC have improved wear and frictional properties in comparison with untreated HFREC. The best tribological and mechanical properties were exhibited by peroxide treated HFREC, which was also confirmed through the SEM images of worn and fractured surfaces of the composites.

Automated summary

This research investigated the effects of sodium carbonate and hydrogen peroxide treatment on hemp fiber reinforced epoxy composites (HFREC), focusing on water absorption, mechanical, and tribological properties. The results showed that both chemical treatments improved water resistance and mechanical properties of the composites, while also enhancing wear and frictional properties. The best overall performance was observed in peroxide treated HFREC, as confirmed by SEM images of worn and fractured surfaces.