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Thermal Conductivity of Individual Electrospun Polymer Nanofibers

[+] Author Affiliations
Jian Ma

Southeast University, Nanjing, China

Qian Zhang, Leon Bellan, Deyu Li

Vanderbilt University, Nashville, TN

Anthony Mayo, Richard Mu

Fisk University, Nashville, TN

Paper No. IMECE2015-50483, pp. V08BT10A031; 7 pages
doi:10.1115/IMECE2015-50483
From:
  • ASME 2015 International Mechanical Engineering Congress and Exposition
  • Volume 8B: Heat Transfer and Thermal Engineering
  • Houston, Texas, USA, November 13–19, 2015
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5750-2
  • Copyright © 2015 by ASME

abstract

In this work, the thermal conductivity of individual polyethylene (PE) nanofibers fabricated by electrospinning was experimental measured. Our results show that polyethylene nanofibers can have a thermal conductivity up to 2.6 Wm−1K−1, (more than 9 times higher than the bulk PE value) and that the thermal conductivity is strongly correlated with the electric field intensity used in electrospinning. This, combined with micro-Raman characterization of individual nanofibers, suggests that the enhanced thermal conductivity is due to the high degree of orientation of the polymer chains. The stronger elongational forces experienced by the jet at higher electrospinning voltage result in the formation of nanofibers with a higher degree of molecular orientation. Similar thermal conductivity enhancement is also observed with other polymer nanofibers including polyethylene oxide (PEO), Nylon-6, and polyvinylidene fluoride (PVDF). Collectively, our results indicate that electrospinning could be an effective approach to produce polymer nanofibers with enhanced thermal conductivity.

Copyright © 2015 by ASME

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