Thermal conductivity of polyethylene: The effects of crystal size, density and orientation on the thermal conductivity
Abstract
Thermal conductivity measurements were made on polyethylene samples which had been crystallized at different temperatures in order to vary density and lamellar crystal thickness. Tests were also made on polyethylenes which were oriented by mechanical shearing and by crystallization in a temperature gradient. The thermal conductivity increased linearly by 50% as the density went from 0.96 to 0.99 gm/cc. By orientation the conductivity was increased ten fold in the direction of molecular orientation and decreased two fold in the perpendicular direction. For samples oriented by deformation at different temperatures, the conductivity apparently correlates with birefringence.
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The enhancement of thermal conductivity in oriented polyethylene was attributed to mechanisms including increased chain alignment along the drawing direction, phonon focusing in the elastically anisotropic crystalline phase, and increased crystallinity.
“The enhancement was attributed to various mechanisms including increased chain alignment along the drawing direction7,14, phonon focusing in the elastically anisotropic crystalline phase15,16, and increased crystallinity12,17.”
From Origin of high thermal conductivity in disentangled ultra-high molecular weight polyethylene films: ballistic phonons within enlarged crystals (2022) · cites this paper as [7]
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Kim, T., Drakopoulos, S. X., Ronca, S., & Minnich, A. J. (2022) · Nature Communications · doi:10.1038/s41467-022-29904-2 · Cited by 63 · see citing works
“The enhancement was attributed to various mechanisms including increased chain alignment along the drawing direction [7, 14], phonon focusing in the elastically anisotropic crystalline phase [15, 16], and increased crystallinity [12, 17].”
Background
- Authors
- Hansen, D., & Bernier, G. A.
- Affiliations
- Rensselaer Polytechnic Institute (US)
- ORCID
- Hansen, D.
- Venue
- Polymer Engineering & Science
- Publisher
- Wiley
- Published
- 1972-05
- Volume
- 12
- Issue
- 3
- Pages
- 204-208
- ISSN
- 0032-3888 (ISSN-L)
- 1548-2634
- OpenAlex
- W2010547045
- Cited by
- 121
- References
- 0
- Citations by year
- 2026: 5 · 2025: 6 · 2024: 8 · 2023: 6 · 2022: 7 · 2021: 11 · 2020: 6 · 2019: 8 · 2018: 9 · 2017: 3 · 2016: 3 · 2015: 2 · 2014: 4 · 2013: 6 · 2012: 3
- FWCI
- 1.06
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Polymer Engineering and Science (publishedVersion)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Materials Science › Materials Chemistry › Material Dynamics and Properties
- Keywords
- polyethylene, thermal conductivity, crystal size, density, lamellar thickness, molecular orientation, mechanical shearing, birefringence, crystallization temperature
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