Polymer Composite with Enhanced Thermal Conductivity and Insulation Properties through Aligned AlO Fiber.

Thermoplastic polyolefins, such as polyethylene (PE), are traditionally one of the most widely used polymer classes with applications in the electric industry, and their nanocomposites have caught the interest of researchers. The linear filler is shown to be beneficial in decreasing the charge injection and hindering the formation of charge packs. So, we demonstrate a novel composite with excellent properties. The low-density polyethylene (LDPE) composite with aligned aluminum oxide (AlO) fiber has been prepared in electric field conditions. The direction of the AlO fiber was parallel to the thickness direction of the LDPE composite. The breakdown strength of the AlO/LDPE composite with 0.2% aligned AlO fiber was 498 kV/mm, which is higher than other fillers induced. The aligned AlO fiber has effect on preventing accumulation of space charge and reducing the amount of free electron in the material. In addition, the thermal conductivity of the LDPE composite (0.22 W/m·K) was increased to 0.85 W/m·K when doped with 0.5 wt% aligned AlO fiber. The present structure provides a new possibility for mass new nanocomposites with excellent microstructures and remarkable functionality.