1. Types and characteristics of polymer matrix materials The higher thermal conductivity of matrix materials, the better the dispersion of filler in matrix, the better the combination of matrix and filler, and the better thermal conductivity of thermal composites.
2. Type of filler The higher thermal conductivity of the filler, the better thermal conductivity of the composites.
3. Shape of filler the sequence of thermal conduction pathways are fibrous , flake and granular, the easier the filler is to form thermal conduction pathways, the better thermal conductivity.
4. Content of filler
The distribution of filler in polymer determines the thermal conductivity of composite. When the content of filler is small, the effect of heat conduction is not obvious. When there is too much filler, the mechanical properties of the composites will be greatly affected. When the content of the filler increases to a certain value, the interaction between the filler forms a network or chain chain in the system. When the direction of the chain is consistent with the direction of heat flow, the thermal conductivity is best. Therefore, there is a critical value of the quantity of heat conducting filler.
5. Bonding characteristics of filler and matrix material interface .The higher the degree of binding between the filler and matrix, the better the thermal conductivity. The suitable coupling agent is used for surface treatment of the filler, and the thermal conductivity can be increased by 10%-20%.
