Two Particle Research Complex Performance Impact Of Each Pair Of Conductive Silicone Rubber

Conductive polymer material is one kind of high polymer material, which is to point to have conductive function (including semi-conductivity, conductivity and superconductivity), and the electrical conductivity is more than10-6s/m. Conductive silicone rubber take silicone rubber as the matrix, blended with the conductive materials (such as carbon black, graphite, metal powder and carbon fiber, etc.), thus giving the composite certain electrical conductivity. Conductive silicone rubber has developed into a kind of new functional materials, which has a broad application prospect, such as the electromagnetic shielding, conductive, antistatic, automatic control and positive temperature coefficient materials and planar heating element, etc.In this article, we take silicone rubber as the matrix, take F900superconductive carbon black, acetylene black and graphite as conductive filler, blend them by mixing mill, then vulcanize them through the plate vulcanizing press, thus we get F900/acetylene carbon black/silicone rubber and F900/graphene nanoplates/silicone rubber composite materials. In addition, through modified to the F900superconducting electrical carbon black, we prepared the modified F900/silicone rubber composites. Respectively, by four point probe tester, electronic rubber tensile tester, hardness tester, thermal analyzer, X-ray diffraction, and scanning electron microscopy (SEM) test means, we can detect these properties of the composites prepared above.The experimental results are as follows:1、Respectively, the resistivity of the F900superconductive carbon black/silicone rubber composite and acetylene black/silicone rubber composite under the different addition were measured. The two kinds of composites identified different percolation threshold. Then, the resistivity of the conductive silicone rubber was measured with the two kinds of carbon black simultaneously. We found a secondary infiltration phenomenon, which is different from the percolation phenomenon of using a single carbon black. When the proportion of F900/Acetylene black/MVQ is10/30/100, the resistivity of composite material is2.72Q.cm.2、The percolation threshold range of GnS(graphene nanoplates) is0.6～1wt%when add the GnS in silicone rubber individually. If the carbon black addition was fixed, the resistivity of silicone rubber composites reduced in a large extent with the addition of GnS. That is to say, by adding the amount of GnS, the amount of carbon black can reduce. Such as the resistivity of composite in the proportion of F900/GnS of17.5/0.2equal with using the F900of25per alone. It reduced the amount of F900significantly, which help to improve the mechanical properties and process ability of the composite material.3、The surface of F900superconductive carbon black was modified by using the coupling agent(CTAB), so that the resistivity and mechanical properties of conductive silicone rubber modified better than before significantly. The reinforcing effect of carbon black is improved obviously. When the proportion of F900of20per was added, the shore hardness from97°A drop to85°A, the tensile strength declined slightly, the elongation at break increased greatly, which is nearly4times.