| dc.description.abstract | The composite material is formed by mixing the base material and the filler, so the composite effect of the material is the comprehensive result of the interaction of the constituent materials and the interface formed by them. Depending on the type of filler, the characteristics of the composite material will change accordingly. In addition to typical composite materials, porous materials can also be regarded as a composite material in which a substrate and air are mixed. According to the distribution and size of the pores inside the material, many different applications can be developed.
The purpose of this research is preparing PDMS porous composites with high thermal conductivity. First, when preparing the composite material, choose graphite as the filler, use the mechanical vibration dispersion method to uniformly disperse it in the solution, and then mix it with PDMS to prepare the graphite/PDMS composite material. In the preparation of the porous structure, the sugar leaching method is used. The graphite/PMDS mixed solution is penetrated into the porous mold and then cured, and then the mold is removed to obtain the graphite/PDMS porous composite material.
Use instruments to measure the basic properties and thermal diffusivity of porous composite materials, and combine them with material parameters to obtain porosity and thermal conductivity. Analyze the basic parameters of composite materials and use different theoretical numerical models to predict the thermal conductivity of the material. Finally, compare the calculated results of different models with experimental measured values to explore the influence of graphite filling concentration and porosity on the thermal conductivity properties.
The results show that increasing the graphite filling concentration can effectively increase the thermal conductivity of the material, and it is roughly proportional to the filler concentration. At the temperature of 343K, due to the insufficient structural strength of the test piece, deformation may occur in a high-temperature environment, which may cause errors in the actual measured value. Therefore, the model cannot be used to effectively forecast the thermal conductivity of the piece. In the future, it is planned to reduce the porosity of the composite material and increase the filler concentration to increase the thermal conductivity and stability of the material. | en_US |