Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE Waste peanut shell based Nylon-6 polymer composite.

ABSTRACT
This study investigates a sustainable approach to producing nylon-6 composites by incorporating biochar as an eco-friendly reinforcing filler to reduce the overall carbon footprint while enhancing material performance. Biochar was derived from waste peanut shells through pyrolysis at 1000°C under ~88 bar autogenic pressure, followed by 1 h of ball milling to obtain particles < 2 μm. X-ray diffraction analysis (XRD) confirmed the nanocrystalline structure of the biochar with identified (002), (100), and (101) carbon planes, and Raman spectroscopy revealed a highly disordered carbon arrangement with a graphitization ratio of 1.45. Nitrogen adsorption analysis showed a microporous texture with a BET surface area of 267 m2 g−1. Nylon-6/biochar composites were fabricated at varying loadings using an APSX-PIM V2 injection molding system. Mechanical and thermal characterization demonstrated notable enhancements in strength, elasticity, thermal stability, and crystallinity. An optimal composition of 0.5 wt% biochar exhibited the highest improvements, achieving a 14% increase in tensile strength and elasticity and a 50% increase in crystallinity, while also retaining the maximum strain-to-fracture among all tested formulations.