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Thermal-Conductivity Measurements of Polymers by a Modified 3ω Technique

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Abstract

A modified 3ω technique is designed for measurement of the thermal conductivity of polymers. In this study, samples are prepared by pressing a platinum (Pt) hot wire into melt polymers, and a LabVIEW-based virtual lock-in amplifier is employed to collect the third harmonic of the voltage across the hot wire, which has proved to overcome the disadvantages of the commercial lock-in amplifier, such as inaccuracy at low frequency, lack of flexibility/scalability, and high cost. Three kinds of commercial polymers are measured at room temperature, and the results are checked against data from the literature, which demonstrates that the modified technique can be used with high accuracy and good reproducibility.

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Authors and Affiliations

  1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China

    Ming Gu, Jian-li Wang & Xing Zhang

Authors
  1. Ming Gu
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  2. Jian-li Wang
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  3. Xing Zhang
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Correspondence to Xing Zhang.

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Gu, M., Wang, Jl. & Zhang, X. Thermal-Conductivity Measurements of Polymers by a Modified 3ω Technique. Int J Thermophys 30, 851–861 (2009). https://doi.org/10.1007/s10765-009-0611-5

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  • DOI: https://doi.org/10.1007/s10765-009-0611-5

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