Study on Improving the Vertical Thermal Conductivity of the Film by Single‐Layer Alumina Arrangement

ABSTRACT Thermal interface material (TIM) is a critical polymer composite material, primarily valued for its adhesive properties and thermal conductivity. The thermal conductivity of TIMs can be further classified into vertical and horizontal directions, with the vertical thermal conductivity significantly influencing the overall heat transfer efficiency. In this study, we first synthesized an acrylic adhesive characterized by strong cohesion and high‐temperature resistance. Subsequently, leveraging the spherical shape of alumina particles and controlling film thickness through coating techniques, we prepared a thermally conductive film featuring a unidirectional arrangement of alumina in the horizontal direction. This film leverages the pressure‐sensitive properties of the adhesive, ensuring direct contact between alumina and both the heat source and the heat sink during practical application, thereby facilitating efficient heat dissipation. The simplicity of the preparation method underscores the significant potential applications of this thermally conductive film.