The Preparation Of Graphene/PTFE Composites And Performance Research

In view of the excellent performance of PTFE and GNs, we prepared GNs/PTFE composites by dry blending method successfully. We studied and got the optimal preparation process of GNs/PTFE composites. The main results are as follows:(1) Through study the preparation of composite materials and process parameters, we got the optimal and optimization parameters.(2) Through study the dispersion effect of GNs treated by SDBS and KH-550, the result show that the dispersion stability of the GNs in the solvent was improved to some extent by different treatment methods and the agglomeration of GNs was reduced. The GNs that modified by SDBS has the best dispersion and dispersion stability.(3) The mechanical properties of the prepared PTFE composites were studied, the result show that a small amount of GNs can effectively improve the tensile strength, elongation at break, compression resilience, hardness and creep relaxation of PTFE composites. By study the comprehensive properties of the composites, the study found the composites in which the GNs modified by SDBS has the best comprehensive properties. When the content is 1%, the tensile strength, elongation at break are increased by 21.5% and 28.6%. When the content is 2%, the creep relaxation rate of the composites was 62.83% and played a significant modification effect(4) The thermoelectric properties and tribological properties of the prepared PTFE composites were investigated. With the increase of the content of GNs the thermal conductivity and wear resistance of PTFE composites were improved to different extents. The GNs modified by SDBS has the best results, when the content is 5%, the composite material resistance drops sharply and reach the seepage threshold.