Synthesis of LDPE–Chitin Composite: A Novel Strategy for Mitigating Synthetic Plastic Pollution

The persistent accumulation of synthetic polymers, particularly low-density polyethylene (LDPE), poses severe ecological challenges due to their resistance to degradation. In this study, a biodegradable LDPE–chitin composite was synthesised as an eco-friendly alternative aimed at mitigating plastic pollution. Chitin, extracted from crustacean shell waste through demineralisation and deproteinisation, was incorporated into thermally softened LDPE at varying ratios. Among the three formulations, the 80:20 LDPE–chitin composite (Sample A) exhibited the most favourable properties, including reduced density (0.7826 g/cm³), high water retention (0.793 g/g (or %)), and moderate hardness (25 D). Microstructural evaluation by scanning electron microscopy revealed porous surfaces with well-dispersed chitin, while energy-dispersive X-ray spectroscopy confirmed successful elemental integration within the matrix. These results demonstrate that chitin addition enhances the degradability and functional characteristics of LDPE, making the composite suitable for sustainable packaging. By utilising seafood waste and reducing reliance on petroleum-based plastics, this approach advances circular economy practices and offers a promising strategy for plastic pollution abatement.