High-Performance Circuit Boards Based on Mesoporous Silica Filled PTFE Composite Materials

摘要

A series of composite materials based on a hydrophobia mesoporous silica (MCM-41-m) filled polytetrafloroethylene (PTFE) were synthesized. The composite boards prepared from the composite materials were thermally stable (T5 percent > 500 deg C). The dielectric constant D_k) and z-axis coefficient of thermal expansion (CTE_Z) were significantly decreased with increasing MCM-41-m content due to the presence of the well-dispersed hydrophobic and ordered mesoporous structure MCM-41-m particles. Ultra low Z)_k (1.70) and CTE_Z (11.8 ppm/ deg C) were obtained for the composite board containing 40 wt percent of MCM-41-m. The result indicated that the as-prepared composite materials are potentially useful as radio-frequency/microwave substrate materials.