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Comparison of thermal conductivities of polypropylene fibers and fibrils

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Abstract

In this work, we compared thermal conductivities of polypropylene fibers and fibrils. The polypropylene fibers were melt spun, and oriented by solid-state drawing. Both wide-angle X-ray scattering and sonic velocity measurements were performed to determine the orientation of fibers. The thermal conductivities of fibers were measured via direct electrical heating method, and that of fibrils were measured via thermal bridge method. Our results show that the thermal conductivity of polypropylene fibers increases linearly with their sonic velocity. This suggests we can use the sonic velocity to characterize the thermal conductivity of semicrystalline polymers. Our results also indicate the average thermal conductivity of fibrils is close to that of fibers. This implies that the low thermal conductivity of polymer fibers is due to the low thermal conductivity of fibrils, instead of thermal resistance between fibrils.

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The data are available from the corresponding author on reasonable request.

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Funding

This work was supported by the Department of Science and Technology of Jiangsu Province (BK20220032), the National Natural Science Foundation of China (52206092, 52127811), Natural Science Foundation of Jiangsu Province (No. BK20210565), and the Fundamental Research Funds for the Central Universities (2242022K40022).

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Author notes

  1. Hao Yin and Chenhan Liu contributed equally to this work.

Authors and Affiliations

  1. Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing, 211189, China

    Hao Yin, Bin Wang, Yong Li, Xue Hu, Junyao Yin, Jinbo Liu, Gutian Zhao & Juekuan Yang

  2. Micro- and Nano-scale Thermal Measurement and Thermal Management Laboratory, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing, 210023, China

    Chenhan Liu

Authors
  1. Hao Yin
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  2. Chenhan Liu
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  3. Bin Wang
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  4. Yong Li
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  5. Xue Hu
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  6. Junyao Yin
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  7. Jinbo Liu
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  8. Gutian Zhao
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  9. Juekuan Yang
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Contributions

Investigation: Hao Yin, Chenhan Liu, Bin Wang, Yong Li, Xue Hu, Junyao Yin; Formal analysis: Hao Yin, Chenhan Liu; Visualization: Jinbo Liu; Writing - Original Draft: Hao Yin; Writing - Review & Editing: Chenhan Liu, Gutian Zhao, Juekuan Yang; Conceptualization: Gutian Zhao, Juekuan Yang; Supervision: Juekuan Yang.

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Correspondence to Gutian Zhao or Juekuan Yang.

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Yin, H., Liu, C., Wang, B. et al. Comparison of thermal conductivities of polypropylene fibers and fibrils. Heat Mass Transfer 60, 677–684 (2024). https://doi.org/10.1007/s00231-024-03463-2

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  • DOI: https://doi.org/10.1007/s00231-024-03463-2

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