The impact of stacking sequence on the mechanical, physical, and biodegradability characteristics of treated coconut leaf sheath fabric with vinyl ester resin hybrid composites was investigated in this work. Hand lay-up approach was used to create the hybrid composite laminates. The specimen preparation and testing were carried out in accordance with ASTM guidelines. The results showed that incorporating coconut leaf sheath into hybrid composites with the same coconut leaf sheath has a higher influence on tensile and hardness qualities. The adherence of coconut leaf sheath fibres to the matrix improves significantly after treatment with NaOH solution. Water absorption plots for various periods of immersion revealed that coconut leaf sheaths with hybrid composites outperform pure natural fibre reinforced composites in terms of water absorption resistance. Due to a rise in the proportion of water absorption, the thickness swelling of hybrid composites increases. The failure of hybrid composites is owing to weak interfacial adhesion between fibre and matrix, according to SEM study of the tensile cracked surface. An analysis of all the laminates found that the hybrid laminates of coconut leaf sheath with extreme fibres plies as skin layer are the best combination, with a good balance of attributes. As a result, they might be used to make doors, roofs, windows, and other oriented materials.

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