Heat Transfer of Semicrystalline Nylon Nanofibers

Hsin Che Chien, Wei Tsu Peng, Te Hsuan Chiu, Pei Hsiu Wu, Yueh Ju Liu, Cheng Wei Tu, Chien Lung Wang*, Ming-Chang Lu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Polymers are generally regarded as thermal insulators. The efficient heat transfer observed in the low-dimensional polymers in the literature mainly result from the larger crystallinity or improved polymer chain orientation in the low-dimensional polymers. However, the role of the amorphous domain on heat transfer in polymers remains unexplored. In this work, we report that the semicrystalline nylon polymer nanofibers can exhibit a very large thermal conductivity of 59.1 ± 3.1 W m-1 K-1 and the heat transfer in the semicrystalline polymer nanofibers was time-dependent. The thermal conductivity of the nanofibers could be modulated to span 3 orders of magnitude from being nearly insulated (∼0.27 ± 0.02 W m-1 K-1) to being highly thermal conductive after annealing (∼59.1 ± 3.1 W m-1 K-1). The time-dependent thermal conductivity was observed at a temperature lower than the gamma transition temperature of the polymer and was a result of the physical aging of the semicrystalline polymer. A phenomenological model was adopted to explain the time-dependent heat transfer of the semicrystalline nanofibers. The physical aging reduced the configuration disorder in the polymer and caused the heat transfer of the semicrystalline polymer to increase during the annealing process.

Original languageEnglish
Pages (from-to)2939-2946
Number of pages8
JournalACS Nano
Volume14
Issue number3
DOIs
StatePublished - 24 Mar 2020

Keywords

  • nanofiber
  • nylon
  • physical aging
  • semicrystalline polymer
  • thermal conductivity

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