Assessing the Structural Feasibility and Recyclability of Flax/PLA Bio-Composites for Enhanced Sustainability 2024-26-0407

Bio-composites have gained significant attention within the aerospace industry due to their potential as a sustainable solution that addresses the demand for lightweight materials with reduced environmental impact. These materials blend natural fibers sourced from renewable origins, such as plant-based fibers, with polymer matrices to fabricate composite materials that exhibit desirable mechanical properties and environmental friendliness. The aerospace sector's growing interest in bio-composites originates from those composites’ capacity to mitigate the industry's carbon footprint and decrease dependence on finite resources. This study aims to investigate the suitability of utilizing plant derived flax fabric/PLA (polylactic acid) matrix-based bio-composites in aerospace applications, as well as the recyclability potential of these composites in the circular manufacturing economy. The bio-composite laminate is produced through a compression molding process involving interleaved layers of PLA and flax fiber mats. We discuss the manufacturing technique, mechanical behavior, thermal characteristics, moisture absorption, and fire resistance properties of the bio-composite. A thorough comparison is drawn between these properties and those of similar bio-composites. Moreover, the study places emphasis on the recycling of these bio-composites by means of mechanical milling, and their subsequent use as additives in the original fiber mat laminated composites. A comprehensive evaluation is conducted, contrasting the attributes of the original laminate with those of the laminate containing recycled additives. The outcomes of this study would be a contribution to understanding and the assessment of the sustainability of bio-based polymer applications. By examining the performance of flax/PLA bio-composites in aerospace composite material qualification settings and investigating their recyclability, this research reveals the viability as an eco-friendly alternative in the aerospace industry, aligning with the industry's ongoing efforts to adopt greener practices and materials.