Research Article Investigation on Interlaminar Shear Strength and Moisture Absorption Properties of Soybean Oil Reinforced with Aluminium Trihydrate-Filled Polyester-Based Nanocomposites L. Natrayan , 1 S. Kaliappan, 2 S. Baskara Sethupathy, 3 S. Sekar, 4 Pravin P. Patil, 5 S. Raja , 6 G. Velmurugan , 7 and Dereje Bayisa Abdeta 8 1 Department of Mechanical Engineering, Saveetha School of Engineering, SIMATS, Chennai, Tamil Nadu 602105, India 2 Department of Mechanical Engineering, Velammal Institute of Technology, 601204, Chennai, Tamil Nadu, India 3 Department of Automobile Engineering, Velammal Engineering College, Velammal New-Gen Park, Ambattur-Redhills Road, 600066, Chennai, Tamil Nadu, India 4 Department of Mechanical Engineering, Rajalakshmi Engineering College, Rajalakshmi Nagar, Thandalam, Chennai, 602 105 Tamil Nadu, India 5 Department of Mechanical Engineering, Graphic Era Deemed to be University, Bell Road, Clement Town, 248002 Dehradun, Uttarakhand, India 6 School of Mechanical Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu, India 7 Institute of Agricultural Engineering, Saveetha School of Engineering, SIMATS, 602 105, Chennai, Tamil Nadu, India 8 Department of Civil Engineering, Ambo University, Ambo, Ethiopia Correspondence should be addressed to L. Natrayan; natrayanphd@gmail.com and Dereje Bayisa Abdeta; dereje.bayisa@ambou.edu.et Received 3 May 2022; Revised 30 June 2022; Accepted 7 July 2022; Published 18 July 2022 Academic Editor: Lakshmipathy R Copyright © 2022 L. Natrayan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. In recent years, research has shifted away from conventional materials and alloys to composite materials to create lighter, more efficient materials for specific applications. In order to generate lighter, more efficient materials for specific purposes, research has migrated away from traditional materials and alloys and toward composite materials in current years. Blended microbially nanocomposite that takes advantage of organic flax fibres and nanoreinforced biobased polymers can increase characteristics while keeping the environment in mind. Adding aluminium trihydride (ATH) powder to the natural resin allows it to sustain rigidity without compromising toughness while increasing barrier and mechanical characteristics. Investigation of several composite samples confirmed this positive effect, with systems that contain 10% epoxidized methyl soyate (EMS) and 2.5 wt.% ATH maintains the original resin’s rigidity, strain to fracture, and hygromechanical characteristics while enhancing toughness. Mechanical testing like interlaminar shear strength (ILSS) was found per the standard ASTM testing method. Among the various combinations, the second combinations (77.5 wt.% polyester, 2.5 wt.% ATH, and 20 wt.% of flax fibre) provide the highest value of ILSS (34.31 MPa). Scanning electron microscopy was used to examine the fractured surface of the nanocomposites and the degree of dispersion of the ATH filler. 1. Introduction Environmental responsiveness has had a tremendous influ- ence on materials engineering and design worldwide in recent years [1, 2]. Concerns about the impact of artificial or hydrocarbon polymeric composites on the environment have led to the development of organic or regenerative com- posites. Biological adhesives, made up of organic fibres in an artificial or organic polymeric matrix, have recently gained a lot of interest due to their low cost, ecologically benign nature, and competition with synthetic composites. Bio- based composites’ utilization has been limited due to their Hindawi Journal of Nanomaterials Volume 2022, Article ID 7588699, 8 pages https://doi.org/10.1155/2022/7588699