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<p>In this study, the existing experimental data on the shear relaxation modulus of polytetrafluoroethylene (PTFE) are systematically summarized. A linear viscoelastic model, which is applicable for PTFE in a wide-temperature range from 4&#xa0;K to 403&#xa0;K, is proposed by using the generalized time–temperature superposition principle with vertical shift, by considering the discontinuity in the glass transition region and atmospheric crystallization transition region and by considering the difference between the tensile and compressive Poisson's ratios of PTFE. Compared with the experimental data, the maximum error of the proposed constitutive model is 2.3%, except for the glass transition region and the atmospheric crystallization transition region, in which the maximum errors are 8.3% and 6.2%, respectively, because of the discontinuity caused by abrupt changes in molecular chain dynamics. The proposed linear viscoelastic model is able to predict the viscoelastic behavior of PTFE sealing elements in low-temperature equipment, especially those operating across a wide-temperature range.</p>

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A Generalized Linear Viscoelastic Model of Polytetrafluoroethylene From 4 K to 403 K

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Lei Zhao,
  • Jiawei Qiao,
  • Jie Zhang,
  • Jing Wang,
  • Quanliang Zhao,
  • Junjie Yuan,
  • Can Huang,
  • Mengying Zhang,
  • Guangping He

摘要

In this study, the existing experimental data on the shear relaxation modulus of polytetrafluoroethylene (PTFE) are systematically summarized. A linear viscoelastic model, which is applicable for PTFE in a wide-temperature range from 4 K to 403 K, is proposed by using the generalized time–temperature superposition principle with vertical shift, by considering the discontinuity in the glass transition region and atmospheric crystallization transition region and by considering the difference between the tensile and compressive Poisson's ratios of PTFE. Compared with the experimental data, the maximum error of the proposed constitutive model is 2.3%, except for the glass transition region and the atmospheric crystallization transition region, in which the maximum errors are 8.3% and 6.2%, respectively, because of the discontinuity caused by abrupt changes in molecular chain dynamics. The proposed linear viscoelastic model is able to predict the viscoelastic behavior of PTFE sealing elements in low-temperature equipment, especially those operating across a wide-temperature range.