Effect of nitride-fiber on functional characteristics of polymer composites

Abstract Polymer matrix composites are prospective for automotive component applications, such as roof frames, cabinets, and seat frames, due to their lightweight, better tensile, and compression strength behaviour. However, the mono-fibre-reinforced polymer matrix exhibited variations in mechanical behaviour due to poor interfacial bonding strength. In this research, nano-boron nitride (BN) particles are introduced during the fabrication of low-density polyethene (LDPE) composites with 15 wt% chopped hemp fibre (chemically treated hemp fibre, or chemically treated HF) through the hot compression moulding technique. Influences of nitride-fiber actions on microstructural and mechanical properties of the synthesized composite were investigated, and X-ray diffraction analysis confirms the crystalline peaks. From transmission electron microscopy analysis, nitride fibres are identified as being widely dispersed within the base LDPE matrix, resulting in enhanced mechanical properties of the composites. The LDPE/15 wt% HF/9 wt% BN composite exhibits a high tensile strength of 25 MPa, an impact toughness of 6.1 J/mm 2 , and a flexural strength of 28 MPa, with a notable enhancement in microhardness value (44 HV). Moreover, lightweight, improved moisture absorption (0.82 %), and higher onset degradation temperature of 356 °C (Higher thermal stability). This composite sample is proposed for automotive roof applications.