A novel concept for fabricating the flexible vapor chamber using the microcrystalline cellulose powder as the wick structure

The research on flexible heat pipes and vapor chambers has been received more and more attention recently. In this paper, a novel concept for fabricating the flexible vapor chamber (FVC) using the microcrystalline cellulose powder (MCP) and carbon-doped liquid crystal polymer (C-LCP) plate was proposed. The microgroove structure was prepared on the surface of C-LCP plate by the laser processing firstly. Then MCP was thermally imprinted into those micro-grooves as the wick structure of FVC. The influence of hot-pressing temperature, hot-pressing pressure and MCP mass on the capillary property of FVC. The result showed that the capillary property of FVC was optimal when the temperature was 150°C, the pressure was 5 kN, and MCP mass was 1 g. The capillary rise height of FVC could reach approximately 96.86 mm with a K/R eff value of 0.145 μm.