Morphology of polyethylene crystallized from the melt under pressure
Abstract
The morphology of linear polyethylene crystallized under pressures up to 5300 atm. has been investigated. Electron micrographs of fracture surfaces obtained from these samples show that the majority of the polymer, at the highest pressures, crystallizes in the form of extended chain lamellae which can be as thick as 3 μ. Electron diffraction patterns show that the molecules are normal to the lamellae. At lower pressures part of the polymer crystallizes in the form of folded chain lamellae, the proportion increasing with decreasing pressure. Well defined kink bands can be observed in the thicker extended chain lamellae. It is suggested that either molecular weight fractionation or an end‐to‐end alignment of the molecules and subsequent folding takes place during the growth of the extended chain lamellae.
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From SAXS, the crystalline domains of nascent polyethylene have long periods of about 10-30 nm, with the corresponding size of the crystalline domain inside the unit being around 90% of the long period.
“from SAXS the crystalline domains have long periods ∼10−30 nm31–33 with the corresponding size of the crystalline domain inside the unit being around 90% of the long period34.”
From Origin of high thermal conductivity in disentangled ultra-high molecular weight polyethylene films: ballistic phonons within enlarged crystals (2022) · cites this paper as [34]
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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 initial crystalline fraction is on the order of ∼ 60 − 70%, as measured using nuclear magnetic resonance (NMR) [29] or heat capacity measurements [30], and from SAXS the crystalline domains have long periods ∼ 10−30 nm [31–33] with the corresponding size of the crystalline domain inside the unit being around 90% o…”
Dolynchuk, O., Kolesov, I., Androsch, R., & Radusch, H.-J. (2015) · Polymer · doi:10.1016/j.polymer.2015.10.017 · Cited by 39 · see citing works
- Authors
- Geil, P. H., Anderson, F. R., Wunderlich, B., & Arakawa, T.
- Affiliations
- Cornell University (US)
- Venue
- Journal of Polymer Science Part A: General Papers
- Publisher
- Wiley
- Published
- 1964-08
- Volume
- 2
- Issue
- 8
- Pages
- 3707-3720
- ISSN
- 0449-2951 (ISSN-L)
- 1542-6246
- OpenAlex
- W2146924922
- Cited by
- 112
- References
- 0
- Citations by year
- 2026: 1 · 2025: 5 · 2024: 1 · 2022: 1 · 2021: 4 · 2020: 1 · 2019: 2 · 2018: 1 · 2017: 2 · 2016: 3 · 2015: 2 · 2014: 2 · 2013: 2 · 2012: 1
- FWCI
- 6.69
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Polymer Science Part A General Papers (publishedVersion)
- Defense Technical Information Center (DTIC) (submittedVersion)
- Topics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Materials Science › Materials Chemistry › Crystallization and Solubility Studies
- Physical Sciences › Materials Science › Materials Chemistry › Solidification and crystal growth phenomena
- Keywords
- linear polyethylene, melt crystallization, high-pressure crystallization, polymer morphology, kink bands, fracture morphology, electron diffraction, molecular orientation, molecular weight fractionation
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