bioplastic composite food packaging nanofiller plastic Apparent density BARRIER Bending strength Biomechanics COMPOSITES Closed cells Composites thermal properties Compression strength Compressive strength DESIGN Density (specific gravity) Elasticity Flexural modulus Grouting Grouting materials MECHANICAL-PROPERTIES Mechanical strength Morphological properties Mortar NANOCELLULOSE NANOPARTICLES Nanostructured materials Natural fibers PLASTIC SOLID-WASTE Physical and mechanical properties