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Dielectric Properties of the Hybrid Board of Polytetrafluoroethylene/ Nano-scale SiO2 Powder
Tsai I-SHOU
The dielectric properties (dielectric constant, dielectric loss factor) of the hybrid board of polytetrafluoroethylene(PTFE) emulsion/ nano-scale SiO2 powder are studied. The process parameters of board fabrication including powder add-on (1-3%), rotational speed (1200-3200 rpm), temperature (30-345șC ), stage of sintering and cooling (1-16) and calendering times (1-12) are altered. The impacts of these parameters on the dielectric properties of the hybrid board are studied. The experimental proceeded as follows: 60% solid content PTFE emulsion was blended and mixed with nano-scale SiO2 powder and coupling agent in a blender. During the mixing, the fabrications of PTFE were formed and impacted by the rotational speed of the blender. After mixing, the viscosity of mixed solution was increased and became to a gel (semi-solid) state. The gel was proceeded with moulding and calendaring in order to release bubble and increase surface uniformity. Then, the gel was solidified by sintering and cooling to hybrid board. The temperature and stage of sintering and cooling plays an important roll for the solidification of hybrid board. Both dielectric constant and dielectric loss factor are decreased with addition of SiO2 powder. Both dielectric constant and dielectric loss factor are decreased with increased rotational speed and reach a maximal, in this study 3000 rpm, and then increased. The temperature and stage of sintering and cooling plays the most important rolls for both dielectric constant and dielectric loss factor.
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Presented at the International Congress
of Nanotechnology, November 7-10, 2004 San Francisco, USA
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