Abstract:Rice husk biochar was prepared at different carbonized temperatures (200 ℃, 300 ℃, 400 ℃, 500 ℃, 600 ℃) by a muffle furnace, the rice husk biochar/high density polyethylene (HDPE) composites were prepared by injection molding, and the performance of the composites was compared and analyzed in order to investigate the effect of rice husk biochar prepared at different carbonized temperatures on the properties of rice husk biochar/HDPE composites. Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) reveal that the biochar obtained at 600 ℃ carbonized temperature shows the lowest polarity and most developed pore structure; differential scanning calorimetry (DSC) shows that the relative crystallization of HDPE is improved with the addition of rice husk biochar; the mechanical tests and dynamic thermal mechanical analysis (DMA) reveal that the flexural strength (45.37 MPa), rigidity and elasticity of rice husk biochar/HDPE composite with 600 ℃ biochar are all the best compared with others, but the rice husk biochar prepared with different carbonized temperatures has little effect on the tensile strength of rice husk biochar/HDPE composite.