Inelastic x-ray scattering from stretch-oriented polyethylene
Abstract
The phonon dynamics in hydrogenated stretched polyethylene was investigated using inelastic x-ray scattering. The dispersion curve of longitudinal acoustic modes describing intrachain collective motions was measured in the first Brillouin zone, and compared to inelastic neutron scattering data on deuterated similar samples. This first exploration of the collective dynamics within the first Brillouin zone reveals the presence of an additional low energy component. In spite of its large energy distribution, this feature is seen to slightly disperse with momentum transfer Q. The possible origins of this low energy scattering are discussed; arguments converge towards the collective dynamics of the amorphous regions.
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The decrease in mean free path at frequencies exceeding about 5.5 THz is consistent with the increase in broadening reported in inelastic X-ray scattering, although the increase occurred at higher frequencies in their data.
“The decrease in MFP at frequencies exceeding ∼5.5 THz is also consistent with the increase in broadening reported in IXS42, although this increase occurred at higher frequencies in their data.”
From Origin of high thermal conductivity in disentangled ultra-high molecular weight polyethylene films: ballistic phonons within enlarged crystals (2022) · cites this paper as [42]
At higher frequencies around 6 THz, inelastic X-ray scattering has been used to obtain a mean free path of about 50 nm for DR 5.5.
“At higher frequencies ∼6 THz, IXS has been used to obtain a MFP of ∼50 nm for DR 5.5 (ref. 42), which is in reasonable agreement with the values inferred from transport studies.”
From Origin of high thermal conductivity in disentangled ultra-high molecular weight polyethylene films: ballistic phonons within enlarged crystals (2022) · cites this paper as [42]
Phonons with such long mean free paths are likely from the longitudinal acoustic branch owing to its high group velocity of about 16-17 km s−1.
“Phonons with such long MFPs are likely from the LA branch owing to its high group velocity vc ~ 16−17 km s−1 (refs. 38–40,42,67).”
From Origin of high thermal conductivity in disentangled ultra-high molecular weight polyethylene films: ballistic phonons within enlarged crystals (2022) · cites this paper as [42]
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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
- Authors
- Mermet, A., David, L., Lorenzen, M., & Krisch, M.
- Affiliations
- European Synchrotron Radiation Facility (FR)
- Lyon 1 Université (FR)
- ORCID
- Venue
- The Journal of Chemical Physics
- Publisher
- AIP Publishing
- Published
- 2003-07-15
- Volume
- 119
- Issue
- 3
- Pages
- 1879-1884
- ISSN
- 0021-9606 (ISSN-L)
- 1089-7690
- OpenAlex
- W1984533260
- Cited by
- 2
- References
- 0
- Citations by year
- 2022: 1
- FWCI
- 0.33
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Journal of Chemical Physics (publishedVersion)
- HAL (submittedVersion)
- Topics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Materials Science › Materials Chemistry › Material Dynamics and Properties
- Physical Sciences › Chemical Engineering › Fluid Flow and Transfer Processes › Rheology and Fluid Dynamics Studies
- Keywords
- stretched polyethylene, lattice dynamics, longitudinal acoustic modes, first Brillouin zone, low-energy scattering, amorphous regions, collective dynamics, deuterated polyethylene
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