Lamination Magic for Heat Transfer: Anisotropic Functional Composites Based on Multilayer Thermal Conductivity Modeling

ABSTRACT Functional devices are widely used in several fields and thermal orientation is an important pursuit in their thermal management. Therefore, the preparation of an anisotropic thermally conductive functional material can enhance the application of micro/nanoscale functional devices in various fields. In this paper, micro‐ and nano‐layer technology was utilized to create alternating layer structures in polymer composites, and multilayer composites with thermally oriented properties were prepared by combining with metal braided fabrics, which provides a new path for innovative applications of functional materials. Through the in‐depth analysis of the heat conduction mechanism of the multilayer model, the expression of the temperature transfer of each layer inside the material was deduced to provide theoretical support for the material preparation. The results showed that the composites have remarkable delamination effect, and the long‐chain molecules exhibit regularity and orientation. The thermal conductivity of the composites reached 0.261–0.606 W/m K, which is improved by 2.5–6.8 times. The temperature rise curve of the composites showed a wave pattern with a more sensitive thermal response, and exhibited a faster and smoother temperature rise under point‐like thermal shock. This result was very helpful for optimizing the heat conduction path and effectively improving the thermal performance and stability of the device.