Characterisation of microcrystalline cellulose from waste green pea pod sheath and its sunn hemp fibre-polyester composite: A step towards greener manufacturing

In this study, a microcrystalline cellulosic biopolymer (MCB) made from Pisum Sativum (green pea) pod waste via a modified thermo-chemical process, and Crotalaria juncea (sunn hemp) fibre was used to create environment-friendly polyester composites. The main objective was to synthesise the MCB from domestic waste and characterize how the addition of hemp alters the strength of the polymeric composite. The MCB was synthesized using green pea pods. The sunn hemp fibres were used in mat form in this study. The composites were made using the hand layup method and post-cured at 110 degrees C for 2 h. The results showed that the addition of sunn hemp fibre and MCB increased the mechanical properties. Similarly, the highest observed fatigue life count for the composite designated PSC3 (2.0 vol.% MCB) was 30862 at 30% ultimate tensile stress. Similarly, the composite PSC3 had the maximum penetration resistance with an absorbed energy of 14.2 J. Moreover, the addition of silane-treated cellulose and fibre provided an improved storage modulus of 6.8 GPa for the PSC3 composite, confirming the improved fibre-matrix fibre interaction and increased toughness. The scanning electron microscope images revealed improved fibre-matrix correlation. These eco-friendly composites with better load-bearing capabilities could be preferred in automated door panels, defence toolboxes, and home interior decoration applications.