Wide-angle X-ray scattering data from stretched UHMWPE samples

Scattered intensity (arbitrary units) versus scattering vector (in reciprocal Angstroms) data at wide angles for drawing ratios 2.5, 5, and 7.5.Supplementary information for 'Ballistic thermal phonons traversing nanocrystalline domains in oriented polyethylene.'Abstract:Thermally conductiv...

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Main Authors:	Nacho Martin-Fabiani-Carrato, Stavros Drakopoulos, Sara Ronca, Austin Minnich, Andrew Robbins
Format:	Data Data
Published:	2019
Subjects:	Soft condensed matter Condensed matter physics not elsewhere classified polymers polyethylene thermal conductivity mean free path Condensed Matter Physics Soft Condensed Matter
Online Access:	https://dx.doi.org/10.17028/rd.lboro.9033998.v2
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id	rr-article-9033998
record_format	Figshare
spelling	rr-article-90339982019-07-31T09:08:39Z Wide-angle X-ray scattering data from stretched UHMWPE samples Nacho Martin-Fabiani-Carrato (3135477) Stavros Drakopoulos (3089025) Sara Ronca (1249011) Austin Minnich (2194132) Andrew Robbins (3197382) Soft condensed matter Condensed matter physics not elsewhere classified polymers polyethylene thermal conductivity mean free path Condensed Matter Physics Soft Condensed Matter Scattered intensity (arbitrary units) versus scattering vector (in reciprocal Angstroms) data at wide angles for drawing ratios 2.5, 5, and 7.5.<div><br></div><div>Supplementary information for 'Ballistic thermal phonons traversing nanocrystalline domains in oriented polyethylene.'</div><div><br></div><div><u>Abstract:</u></div><div>Thermally conductive polymer crystals are of both fundamental and practical interest for their high thermal conductivity that exceeds that of many metals. In particular, polyethylene fibers and oriented films with uniaxial thermal conductivity exceeding 50 Wm−1K−1 have been reported recently, stimulating interest into the underlying microscopic thermal transport processes. While ab-initio calculations have provided insight into microscopic phonon properties for perfect crystals, such properties of actual samples have remained experimentally inaccessible. Here, we report the direct observation of thermal phonons with mean free paths up to 200 nm in semicrystalline polyethylene films using transient grating spectroscopy. Many of the mean free paths substantially exceed the crystalline domain sizes measured using small-angle x-ray scattering, indicating that thermal phonons propagate ballistically within and across the nano-crystalline domains, with those transmitting across domain boundaries contributing nearly a third of the thermal conductivity. Our work provides the first direct determination of thermal phonon propagation lengths in molecular solids, providing insights into the microscopic origins of their high thermal conductivity.<br></div> 2019-07-31T09:08:39Z Dataset Dataset 10.17028/rd.lboro.9033998.v2 https://figshare.com/articles/dataset/Wide-angle_X-ray_scattering_data_from_stretched_UHMWPE_samples/9033998 CC BY-NC 4.0
institution	Loughborough University
collection	Figshare
topic	Soft condensed matter Condensed matter physics not elsewhere classified polymers polyethylene thermal conductivity mean free path Condensed Matter Physics Soft Condensed Matter
spellingShingle	Soft condensed matter Condensed matter physics not elsewhere classified polymers polyethylene thermal conductivity mean free path Condensed Matter Physics Soft Condensed Matter Nacho Martin-Fabiani-Carrato Stavros Drakopoulos Sara Ronca Austin Minnich Andrew Robbins Wide-angle X-ray scattering data from stretched UHMWPE samples
description	Scattered intensity (arbitrary units) versus scattering vector (in reciprocal Angstroms) data at wide angles for drawing ratios 2.5, 5, and 7.5.Supplementary information for 'Ballistic thermal phonons traversing nanocrystalline domains in oriented polyethylene.'Abstract:Thermally conductive polymer crystals are of both fundamental and practical interest for their high thermal conductivity that exceeds that of many metals. In particular, polyethylene fibers and oriented films with uniaxial thermal conductivity exceeding 50 Wm−1K−1 have been reported recently, stimulating interest into the underlying microscopic thermal transport processes. While ab-initio calculations have provided insight into microscopic phonon properties for perfect crystals, such properties of actual samples have remained experimentally inaccessible. Here, we report the direct observation of thermal phonons with mean free paths up to 200 nm in semicrystalline polyethylene films using transient grating spectroscopy. Many of the mean free paths substantially exceed the crystalline domain sizes measured using small-angle x-ray scattering, indicating that thermal phonons propagate ballistically within and across the nano-crystalline domains, with those transmitting across domain boundaries contributing nearly a third of the thermal conductivity. Our work provides the first direct determination of thermal phonon propagation lengths in molecular solids, providing insights into the microscopic origins of their high thermal conductivity.
format	Data Data
author	Nacho Martin-Fabiani-Carrato Stavros Drakopoulos Sara Ronca Austin Minnich Andrew Robbins
author_facet	Nacho Martin-Fabiani-Carrato Stavros Drakopoulos Sara Ronca Austin Minnich Andrew Robbins
author_sort	Nacho Martin-Fabiani-Carrato (3135477)
title	Wide-angle X-ray scattering data from stretched UHMWPE samples
title_short	Wide-angle X-ray scattering data from stretched UHMWPE samples
title_full	Wide-angle X-ray scattering data from stretched UHMWPE samples
title_fullStr	Wide-angle X-ray scattering data from stretched UHMWPE samples
title_full_unstemmed	Wide-angle X-ray scattering data from stretched UHMWPE samples
title_sort	wide-angle x-ray scattering data from stretched uhmwpe samples
publishDate	2019
url	https://dx.doi.org/10.17028/rd.lboro.9033998.v2
_version_	1797823457627471872

Wide-angle X-ray scattering data from stretched UHMWPE samples

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