Preparation And Properties Of Polyethylene / Nano-composite Of Molybdenum Disulfide Functions

Polyethylene is a good insulator with high volume resistivity, but the plastic will create static in the process of produced, transported and used. So, studying on conductive polyethylene composites is significant.In this paper, the functional composites were prepared by melt-mixing high-density polyethylene and on selecting high-density polyethylene as the fundamental resin and nanoscale molybdenum disulfide as the conductive fillers; we present the main research in brief as follows:1. The molybdenum disulfide is crushed and exfoliated by Supersonic jet mill, and then the product is characterized by using XRD and SEM.The results show that, the average size of grains becomes small and the layers of molybdenum disulfide have exfoliated, we get nanoscale molybdenum disulfide.2. The functional composites were prepared by melt-mixing high-density polyethylene and on selecting high-density polyethylene as the fundamental resin and nanoscale molybdenum disulfide as the conductive fillers. Study the effect of MoS₂ content and Diameter-Thickness on electrical conductivity property of composites. Study the morphology of nano-MoS₂ in HDPE and discuss elementarily the transport mechanism of HDPE/ nano-MoS₂ functional composites.The results show that, the volume resistivity of the HDPE/ nano-MoS2 composites decreased visibly with the increasing of nano-MoS₂ content, the volume resistivity of composites is 5.1 × 10⁹Ω ·cm as well as the conductive path have formed by contacting of conductive fillers in HDPE/ nano-MoS₂ composites when the nano-MoS₂ content reaches 25 %, the composites transfer from insulator into antistatic. The electrical conductivity property and percolation threshold of the HDPE/ nano-MoS)2 composites are related toDiameter-Thickness of conductive filler. The Diameter-Thickness is smaller, the electrical conductivity property is better and the percolation threshold is lower. The percolation threshold of HDPE/ nano-MoS2 composites is 15%, the percolation threshold of HDPE/ MoS2 composites is 25 % yet.3. Study the crystal structure of composites and the effect of nano-MoS2 content on the crystallization behavior of High-density polyethylene and thermal stability of composites.The results show that, with the increasing of nano-MoS2 content, the crystallization temperature of High-density polyethylene in composites increased a little and the melt temperature does not show much variation, the degree of crystalllinity reduced approximately 10% and melt- enthalpy is reduced from 189.0 J g"' to 139.4 J g"1, the thermal stability of the composites as well as is improved. The interlayer distance of nano-MoS2 in HDPE/ nano-MoS2 composites becomes small, which is likely to result from the interaction of HDPE and nano-MoS2 when melt-mixing.