Novel Polyethylene Fibers of Very High Thermal Conductivity Enabled by Amorphous Restructuring

Zhu, Bowen; Liu, Jing; Wang, Tianyu; Han, Meng; Valloppilly, Shah; Xu, Shen; Wang, Xinwei

doi:10.1021/acsomega.7b00563

Title: Novel Polyethylene Fibers of Very High Thermal Conductivity Enabled by Amorphous Restructuring

Journal Article · Wed Jul 26 00:00:00 EDT 2017 · ACS Omega

DOI:https://doi.org/10.1021/acsomega.7b00563· OSTI ID:1372710

Zhu, Bowen ^[1]; Liu, Jing ^[1]; Wang, Tianyu ^[1]; Han, Meng ^[1]; Valloppilly, Shah ^[2]; Xu, Shen ^[3];

^[1]

Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, United States
Nebraska Center for Materials and Nanoscience, University of Nebraska at Lincoln, Lincoln, Nebraska 68588, United States
Automotive Engineering College, Shanghai University of Engineering Science, 333 Longteng Road, 201620 Shanghai, P. R. China

High-thermal-conductivity polymers are very sought after for applications in various thermal management systems. Although improving crystallinity is a common way for increasing the thermal conductivity (k) of polymers, it has very limited capacity when the crystallinity is already high. In this work, by heat-stretching a highly crystalline microfiber, a significant k enhancement is observed. More interestingly, it coincides with a reduction in crystallinity. The sample is a Spectra S-900 ultrahigh-molecular-weight polyethylene (UHMW-PE) microfiber of 92% crystallinity and high degree of orientation. The optimum stretching condition is 131.5 °C, with a strain rate of 0.0129 s^–1 to a low strain ratio (~6.6) followed by air quenching. The k enhancement is from 21 to 51 W/(m·K), the highest value for UHMW-PE microfibers reported to date. X-ray diffraction study finds that the crystallinity reduces to 83% after stretching, whereas the crystallite size and crystallite orientation are not changed. Cryogenic thermal characterization shows a reduced level of phonon-defect scattering near 30 K. Polarization Raman spectroscopy finds enhanced alignment of amorphous chains, which could be the main reason for the k enhancement. In conclusion, a possible relocation of amorphous phase is also discussed and indirectly supported by a bending test.

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Research Organization:: Iowa State Univ., Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: EE0007686; NE0000671

OSTI ID:: 1372710

Alternate ID(s):: OSTI ID: 1508127

Journal Information:: ACS Omega, Journal Name: ACS Omega Vol. 2 Journal Issue: 7; ISSN 2470-1343

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 74 works

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