Preparation And Properties Of Polymer-based Composites With High Thermal Conductivity

With the development of the micro electronic information technology, and the traditional electronic components are gradually developing towards high precision and high integration. This means that the electronic device generates more heat in the unit volume. In order to protect electronic equipment can efficiently work for a long time. The unwanted heat must be removed. Thermal conductive of filled polymer composites were gradually developed based on this factor. In this paper, we use high thermal conductive fillers, such as alumina(Al2O3), graphene oxide(GO), and use carbon fiber fabric(CF) and carbon fiber/basalt fiber fabric(BF/CF) as the reinforced material, respectively to preparation of the thermal co nductive casting and thermal conductive laminate.In order to improve the compatibility and interfacial bonding strength between Al2O3 filler and resin matrix, a two-step modifying method wes applied. In the process of grafting, Al2O3 nanoparticles were first used to generate an epoxy group(Al2O3-KH560) at its surface, and then to produce amino(Al2O3-PA650) with low molecular polyamide. The interface structure of the filler was characterized by infrared and thermal weightlessness. Three kinds of alumina particles with different interfacial structures were selected for the epoxy composite materials. To study the performance of thermal conductivity, mechanical, morphology and other performance of composite materials, thermal conductivity meter, thermogravimetric analyzer, scanning electron microscope, universal testing machine were used. It was found that Al2O3-PA650 not only improved the dispersion in epoxy matrix, but also influenced largely the thermal conductivity properties of epoxy composites. Meanwhile, the thermal conductivity and mechanical properties of epoxy composites were significantly improved by adding trace graphene oxide compound with alumina. When using 30 wt% Al2O3-PA650 and 1 wt% graphene oxide, the thermal conductivity coefficient of composite materials can reach 0.61 W/m K, increased by 157% than pure epoxy resin.The CF fabric and BF/CF fabric reinforced laminate were prepared on the basis of surface modification of Al2O3 fillers. Then the performance of thermal conductivity and mechanical of laminates were studied. The effect of different amount of Al2O3-PA650 fillers on the properties of two kinds of epoxy laminates were discussed. Results showed that the longitudinal and transverse thermal conductivit y coefficient of two kinds of epoxy laminate were increases at the beginning and then decreases with the increase of Al2O3-PA650 fillers. When the mass fraction of Al2O3-PA650 was 30%, the longitudinal thermal conductivity coefficient of two kinds of laminate achieved 1.05 and 0.61 W/m K respectively, and showed a largest difference. The mechanical properties of CF reinforced epoxy laminate were better than BF/CF reinforced epoxy laminate, and they have a same changing trend with the increase of filler content.