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Revisiting stress-oscillation in cold drawing of poly(ethylene terephthalate)
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Heeley, Ellen L., Smith, Jessica, Wan, Chaoying, Huband, Steven, Brambley, E. J. and Hughes, Darren J. (2023) Revisiting stress-oscillation in cold drawing of poly(ethylene terephthalate). Polymer, 285 . 126364. doi:10.1016/j.polymer.2023.126364 ISSN 0032-3861.
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WRAP-revisiting-stress-oscillation-cold drawing-poly(ethylene-terephthalate)-2023.pdf - Accepted Version Embargoed item. Restricted access to Repository staff only until 15 September 2024. Contact author directly, specifying your specific needs. - Requires a PDF viewer. Download (1775Kb) |
Official URL: http://dx.doi.org/10.1016/j.polymer.2023.126364
Abstract
This paper investigates the unusual phenomenon of stress-oscillation (SO) where a polymer exhibits periodic oscillatory neck propagation during drawing. It has been suggested that heat generation at the neck is critical, while other theories propose that an unstable neck stress is the controlling mechanism. Here, we study cold-drawing of poly(ethylene terephthalate) at 100 mm min−1 where SO has been monitored by thermal analysis. The morphology of the transparent and opaque bands were investigated using DSC, X-ray scattering and microscopy. It is revealed that heat release is a consequence of the plastic deformation as opposed to being the cause of the yielding. Neck geometry plays a key role in the mechanism. Temperature rise at the neck is low (9 °C) and does not lead to a change in crystalline morphology between the transparent and opaque bands. It is concluded that stress-induced crystallization plays no role in the SO process for cold drawn PET and that the opaque bands result from axial voiding during high strain-rate yielding.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QA Mathematics Q Science > QC Physics T Technology > TP Chemical technology |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Mathematics Faculty of Science, Engineering and Medicine > Science > Physics Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) |
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Library of Congress Subject Headings (LCSH): | Polyethylene terephthalate, Thermography, X-rays—Scattering , Small-angle x-ray scattering | ||||||||
Journal or Publication Title: | Polymer | ||||||||
Publisher: | Elsevier Science BV | ||||||||
ISSN: | 0032-3861 | ||||||||
Official Date: | 1 October 2023 | ||||||||
Dates: |
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Volume: | 285 | ||||||||
Article Number: | 126364 | ||||||||
DOI: | 10.1016/j.polymer.2023.126364 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 4 October 2023 |
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