With the combined advantages of polymers and ceramic fillers, Polymer-ceramic dielectric composites are widely used in microwave substrates due to their excellent dielectric properties, good mechanical properties, and easy formability. To optimize the properties of polymer composites, it is necessary to enhance the compatibility between polymer matrix and ceramic filler. In this study, to realize polytetrafluoroethylene (PTFE) composites with low dielectric constant, low dielectric loss, good mechanical properties and appropriate coefficient of thermal expansion, PTFE/SiO₂ composites were prepared by demulsification treated PTFE and modifying SiO₂ with silane treatment. Compared with PTFE composites, the mechanical properties of PTFE/SiO₂ composites prepared by the demulsification treatment were improved at a low SiO₂ content. Compared with the untreated PTFE composites, treated PTFE composites exhibit better properties such as lower dielectric loss, good mechanical properties and lower CTE. Furthermore, the composites show low dielectric constant and loss even at frequencies up to 10 GHz.

聚合物陶瓷介电复合材料综合了聚合物和陶瓷填料的优点，由于其优异的介电性能、良好的机械性能和易成型性而广泛应用于微波衬底。为了优化聚合物复合材料的性能，需要增强聚合物基体与陶瓷填料之间的相容性。本研究为实现低介电常数、低介电损耗、良好的机械性能和合适的热膨胀系数的聚四氟乙烯(PTFE)复合材料，采用破乳处理PTFE和硅烷处理SiO ₂改性制备PTFE/SiO 2 复合_材料。_{与PTFE复合材料相比，PTFE/SiO 2}的力学性能破乳处理制备的复合材料在低SiO ₂含量下性能得到改善。与未经处理的PTFE复合材料相比，经过处理的PTFE复合材料表现出更好的性能，例如较低的介电损耗、良好的机械性能和较低的CTE。此外，即使在高达 10 GHz 的频率下，复合材料也表现出低介电常数和损耗。