Preparation and Thermal Conductivity Study of High Density Polyethylene/Silicon Carbide Whiskers Composites
Silicon carbide whiskers(SiCw)were used as reinforcing fillers in high-density polyethylene(HDPE)to prepare high-density polyethylene/silicon carbide whiskers(HDPE/SiCw)composites.By characterizing and analyzing the thermal conductivity,Vicat softening temperature,thermal and mechanical properties of HDPE/SiCw composites,the influence of SiCw content on the mechanical and thermal conductivity of HDPE composites is explored.The results showed that with the increase of SiCw content,the thermal conductivity of HDPE composites continued to increase,and the melting temperature Tm and enthalpy ΔH both continued to increase.The thermal stability of HDPE composites has been effectively improved.At the same time,the Vicat softening temperature of HDPE composites shows a trend of first increasing and then slightly decreasing.The elastic modulus,yield strength,and fracture strength of HDPE composites all show a trend of first increasing and then fluctuating or stable changes,while the elongation at break shows a decreasing trend.When the SiCw content is 30%,the thermal conductivity of HDPE/SiCw composites is 0.85 W/(m·K),the melting temperature Tm and enthalpy ΔH were 144.12℃and 162.1 J/g,respectively.The elastic modulus,yield strength,and fracture strength of HDPE composites were 1 301.0,36.5,22.4 MPa,respectively,increased by 47.51%,36.70%,57.75%,respectively compared with pure HDPE.
High density polyethyleneSilicon carbide whiskersThermal conductivityMechanical property
万方数据
维普
