Thermal Conductivity Improvement of Fiber Orientation Control by Sheet Folding Method

In this study, the thermal conductivity of polymer composite sheet which had filler orientation of out-of-plane direction was experimentally investigated by using laser flash method. The polymer composite sheet consisting of polystyrene and carbon fiber was fabricated by secondary process of an intermediate sheet in which carbon fibers were oriented in one direction. That is, a zigzag shape was given to the intermediate sheet, and a composite sheet with a thickness of 1 mm was obtained by folding the sheet. The results showed that the effective thermal conductivity of 1.74 W/(mK) was achieved at the carbon fiber volume fraction of 15% and unaligned carbon fibers at the folded corner part affected the effective thermal conductivity of the sample.