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A series of composite materials based on a hydrophobic mesoporous silica (MCM-41-m) filled polytetrafloroethylene (PTFE) were synthesized. The composite boards prepared from the composite materials were thermally stable The dielectric constant and z -axis coefficient of thermal expansion 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 (1.70) and (11.8 ppm/°C) were obtained for the composite board containing 40 wt % of MCM-41-m. The result indicated that the as-prepared composite materials are potentially useful as radio-frequency/microwave substrate materials.
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Chen‐Yang et al. (2004) studied this question.
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