Study On Double-percolation Threshold Thermoplastic Antistatic Composites

Conductive materials developed rapidly. According to the priority combined principle and insitu composites theory the paper prepared a new type of low carbon content HDPE/EAA/GF/CB Antistatic Materials by injection-style. Goal is to ensure the electric-performance and further reduce content of the conductive media,to improved the mechanical and processing performance,and to provide a new way for the research and development of materials. The results are as follows:1.The innovated HDPE/EAA/GF/CB composite met the electrostatic dissipative requirement (106-109?.cm) well when the carbon content is no more than 7%. The double-percolation structure spontaneously during the hot-compounding processing steps to form an EAA coated GF and CB located at the surface of HDPE/EAA interface and also within the coating EAA. The formation of this structure made the percolation happen at a much lower level. The affinity between EAA and GF is a critical factor in the formation of this structure.2. The HDPE/EAA/GF/CB material had the best electric performance when the EAA loading was between 5% and 20%. At the same time, the GF loading in system could vary in a relatively wide range with the material having required electric capability, while there was little difference when the GF was treated with different silane coupling. When the compatibilization was added into the system, CB could not form passways through EAA and the material resistance would increase greatly. The effective concentration of CB in the system would reduced when the HDPE was first mixed with CB and GF and then with EAA, resulting in greatly increased volume resistance of HDPE/EAA/GF/CB material.3. The storage modulus of four-multiple systems is greater than the ternary system. The ternary system is greater than the binary system because of the more interface phase. The content of EAA has a greater impact on the, The storage modulus of four-multiple systems with 10% content of EAA is greater than the four-multiple with 15% content. while the four-multiple with 20% percent has the largest storage modulus. Loss factor rise with temperature, and at the same conditions, HDPE/EAA/GF/CB(57/20/15/8)has the largest loss factor,while HDPE/EAA/GF/CB(67/10/15/8) the smallest loss factor.4. The innovated HDPE/EAA/GF/CB material has better dynamic capabilities than the traditional ones, such as more space stability. And due to the CB particles in it unlikely falling off,it can be used in some fields which have certain requirements in environment.