Preparation and Composition Optimization of PEO:MC Polymer Blend Films Reinforced with Graphene Nanoplatelets for Enhanced Mechanical Properties

In this work, nanocomposite films based on a polyethylene oxide : methylcellulose (50 : 50) blend were synthesized and reinforced with graphene nanoplatelets at varying concentrations (0–20 wt %). Structural analysis by X-ray diffraction revealed a reduction in crystallinity with increasing graphene loading, while scanning electron microscopy and energy-dispersive X-ray spectroscopy confirmed morphological evolution and carbon enrichment after filler incorporation. The mechanical results demonstrated significant enhancement in hardness, tensile strength, and Young’s modulus at 5 wt % graphene nanoplatelets; at higher loadings the properties deteriorated because of filler aggregation. The findings highlight the critical role of graphene dispersion and provide valuable guidance for optimizing nanofiller content in polymer systems for high-performance applications.