| Electrically conductive macromolecule composite as one of the important functional material has been widely used in the electrostatic dissipative field. Because of its advanced prosperities such as low weight, durability, easy-to-be-processed and stability in electrical conduction, the market need has increased continuously. In this paper, an innovated electrostatic dissipative (ESD) PP/PA/GF/CB composite based on very low carbon black (CB) loadings has been prepared with extruding-injection method according to the first-combination and the in-situ theory. We try to explore a new way in the development of electrostatic dissipative materials, which have the good electric capability, lower loadings of conductive medium and better dynamic and processing prosperities. Here are our results.1.The innovated PP/PA/GF/CB composite met the electrostatic dissipative requirement (106—109?/sq ) well when the carbon loading is less than 2%.And this is the first time in the country. The triple-percolation structure spontaneously during the hot-compounding processing steps to form an PA coated GF and CB located at the surface of PP/PA interface and also within the coating PA. The formation of this structure made the percolation happen at a much lower level. The affinity between PA and GF is a critical factor in the formation of this structure.2.The PP/PA/GF/CB material had the best electric capability when the PA 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 PA and...
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