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Effect of sintering temperature on the crystallization behavior and properties of silica filled PTFE composites

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Abstract

The present study investigated the effect of sintering temperature on the crystallization behavior of polytetrafluoroethylene (PTFE) polymer in SiO2 filled PTFE (PTFE/SiO2) composites, as well as the dependences of dielectric properties, thermal conductivity, water absorption and density on the sintering temperature of composites. The composites were sintered by hot pressing at temperatures of 350–390 °C. The melting peaks of the sintered composites were recorded by the differential scanning calorimetry (DSC), and heats of melting were calculated from the peak areas in DSC curves, then the crystallinity of PTFE in composites was deduced. The intensities of the crystal diffraction peak for PTFE were observed by X-ray diffraction analysis. Moisture absorption of the composites was measured conforming to IPC-TM-650 2.6.2. Archimedes’ principle was used to find out the density of the composites. The dielectric constant and loss tangent of the composites were evaluated at microwave frequency region using strip line resonator method according to IPC-TM-650 2.5.5.5 specification. Thermal conductivity was measured by laser thermal conductivity meter. Morphology of PTFE crystals and dispersion of fillers in the PTFE matrix were studied using scanning electron microscopy.

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Acknowledgments

This work has been supported by the Fundamental Research Funds for the Central Universities of China (No. ZYGX2012J035).

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Authors and Affiliations

  1. National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Jianshe Road, Chengdu, 610054, People’s Republic of China

    Ying Yuan, Bin Tang, Enzhu Li & Shuren Zhang

  2. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Jianshe Road, Chengdu, 610054, People’s Republic of China

    Ying Yuan, Dingding Yu, Yuting Yin, Bin Tang, Enzhu Li & Shuren Zhang

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  1. Ying Yuan
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  2. Dingding Yu
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  3. Yuting Yin
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  4. Bin Tang
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  5. Enzhu Li
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  6. Shuren Zhang
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Correspondence to Ying Yuan.

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Yuan, Y., Yu, D., Yin, Y. et al. Effect of sintering temperature on the crystallization behavior and properties of silica filled PTFE composites. J Mater Sci: Mater Electron 27, 13288–13293 (2016). https://doi.org/10.1007/s10854-016-5477-2

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  • DOI: https://doi.org/10.1007/s10854-016-5477-2

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