Effect of Cutting Aramid Fiber on the Properties of Biochar/Linear Low-Density Polyethylene Composites

Biochar composites attract much attention for their good properties, but further applications are limited due to the poor impact strength. Cutting aramid fiber, biochar and linear low-density polyethylene (LLDPE) were used to prepare composites by injection molding and the effects of cutting aramid fiber on the properties of the composites were explored. The results show that the addition of cutting aramid fiber does not change the crystal structure of biochar/ LLDPE composites, there is good interface compatibility between cutting aramid fiber, biochar and LLDPE. Adding cutting aramid fiber increases the maximum degradation temperature, and improves the thermal stability, heat resistance and crystallinity of the composites. The biochar/LLDPE composite has better mechanical properties, its flexural strength, flexural modulus, tensile strength and tensile modulus are 14.28 MPa, 0.64 GPa, 12.02 MPa and 0.25 GPa, respectively. Also, the addition of cutting aramid fiber reduces the flexural strength, flexural modulus, tensile strength, tensile modulus, creep strength and stress relaxation resistance of the composites, but improves the stiffness and elasticity, especially the toughness of the composites. The impact strength of the composites is up to 9.40 kJ/m2. The composites prepared in this study overcome the fragility defects of biochar composites and are important to further broaden the application scope of biochar composites. © 2023 Chengdu University of Science and Technology. All rights reserved.