Efficient Calculation And Simulation Research On Electrical Conductivity Of Polymer Composites Filled With Carbon Nanotubes

With the development of flexible tactile sensor based on conductive composite,it is necessary to design flexible conductive composite with excellent properties.Polymer composite filled with carbon nanotubes(CNTs)have attracted extensive attention due to the advantages of high performance and low cost.The electrical properties of composites depend on many parameters,which is difficult to control accurately and efficiently in the experiment.Computer modeling and simulation technology can control the changes of various parameters in the study accurately,and provide a low-cost and efficient method for the study of material properties,and is widely used in the study of electrical properties of composite materials.Computer modeling and simulation technology is used in the paper.According to the actual morphology of CNTs in composites,a broken-line model is constructed.According to the boundary conditions of CNTs distribution in polymer matrix and the distance relationship between CNTs,a series of three-dimensional models for carbon nanotube composites with different volume fractions are established by random filler removal method.The k-d tree method is used as the nearest neighbor particle search algorithm.Based on the conductive network in the three-dimensional model,the distance matrix between CNTs is established.Combined with the conductive mechanism of carbon nanotube composites,the resistance matrix between CNTs is generated.The equivalent resistance calculation method of large pure resistance network is used to solve the resistance matrix,and the electrical conductivity of composite is obtained.The calculated results are highly consistent with the experimental data,which indicates that the conductivity simulation model constructed in this paper can predict the conductivity of composite materials accurately.The conductivity simulation model of CNT filled conductive composites is used to calculate the conductivity when the aspect ratio of CNTs,non-conductive filler and spatial distribution of CNTs are changed.The results show that we can get the change rule of conductivity with different parameters based on the simulation model established in this paper,and provide theoretical reference for the design of high-performance carbon nanotube composites in the fields of electronic skin and flexible tactile sensor.