Polymer Melt Fracture

Koopmans, R. J.; Doelder, C.F.J. den; Molenaar, J.

doi:10.1201/9781420018288

Cited by 34 publications

(41 citation statements)

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“…It indicates that the critical shear stress for the shark-skin instability is between 7.9 × 10 4 Pa and 1.3 × 10 5 Pa. Although the value is slightly lower than those of polyethylene, 1 -2 × 10 5 Pa [4], the difference between them is not so significant. It is interesting because ETFE has narrow molecular weight distribution, leading to low critical stress [9], as compared with commercialized polyethylene.…”

Section: Resultscontrasting

confidence: 48%

“…It has been well known that flow instability at capillary extrusion is roughly classified into two categories; surface instability known as shark-skin failure and gross, volumetric, and wavy melt fracture [1][2][3][4]. Meller et al summarized that the shark-skin failure occurs beyond the critical shear stress at the die exit and the wavy melt fracture takes place beyond the critical elongational stress at the die entry [5].…”

Section: Introductionmentioning

confidence: 99%

“…For example, linear low-density polyethylene (LLDPE) having no strain-hardening shows the shark-skin failure at low shear rate, whereas low-density polyethylene with long-chain branches (LDPE), that is known to show marked strain-hardening in elongational viscosity, exhibits the wavy melt fracture prior to shark-skin. Moreover, there are at least two origins of the shark-skin failure [2][3][4]6]; one is the cohesive rupture by the sudden deformation of the surface area after passing the die exit, and the other is the irregular slippage. The critical stresses of both mechanisms were discussed by Allal et al, which were summarized in the following relations [7,8], …”

Section: Introductionmentioning

confidence: 99%

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Flow property at capillary extrusion for ethylene–tetrafluoroethylene copolymer

Kotera

Yamaguchi

2015

Journal of Fluorine Chemistry

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Section: Resultscontrasting

confidence: 48%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flow property at capillary extrusion for ethylene–tetrafluoroethylene copolymer

Kotera

Yamaguchi

2015

Journal of Fluorine Chemistry

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“…Production problems (such as extrusion instabilities [32]) would be predicted and partially overcome through improved design. One could also think of using an on-line computational rheology model in concert with appropriate control algorithms to provide for intelligent, physics-based process control techniques.…”

Section: The Role Of Computational Rheologymentioning

confidence: 99%

Multi-scale Modeling and Simulation of Polymer Flow

Binétruy

Chinesta

Keunings

2015

Flows in Polymers, Reinforced Polymers and Composites

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The flow of polymeric fluids in complex geometries relevant to processing applications can be simulated numerically using a wide variety of theoretical models. Simple mathematical models have a purely macroscopic nature and focus only on the non-linear relationship between shear viscosity and shear rate. More advanced models address the viscoelastic character of polymeric fluids, either in a macroscopic or multi-scale framework. These advanced models and the related numerical approaches are the subject of this first chapter, wherein we build upon and update our previous reviews of the field [29,31].

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“…[15,16] for reviews on wall slip and instabilities, and Ref. [17] for a handbook on polymer fracture.…”

Section: Introductionmentioning

confidence: 99%

Periodic “stick-slip” transition within a continuum model for entangled supramolecular polymers

Boudara

Read

2018

Journal of Rheology

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Article:Boudara, VAH orcid.org/0000-0001-8156-0402 and Read, DJ orcid.org/0000-0003-1194-9273 (2018) Periodic "stick-slip" transition within a continuum model for entangled supramolecular polymers. Journal of Rheology, 62 (1). pp. [249][250][251][252][253][254][255][256][257][258][259][260][261][262][263][264] https://doi.org/10.1122/1.5000454 © 2017 by The Society of Rheology, Inc. This is an author produced version of a paper accepted for publication in Journal of Rheology. Uploaded in accordance with the publisher's self-archiving policy. This is an author produced version of a paper accepted for publication in Journal of Rheology. Uploaded in accordance with the publisher's self-archiving policy.eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. AbstractWe investigate shear flow instabilities using a recently-derived constitutive law, designed for describing the rheology of entangled telechelic polymers. The continuum model displays shear banding, often accompanied by a strong elastic recoil in the transient response, which appears as an "apparent" wall slip. For certain parameters, the model also displays a novel "apparent" stick-slip behavior, giving rise to strong nonlinear oscillations in the stress response driven by a repeating cycle of elastic recoil followed by diffusive rehomogenization of the flow. We elucidate the detailed mechanism behind this oscillatory response, demonstrating that it arises from a competition between shear-induced breaking of sticky bonds, which leads to recoil and banding, and a diffusive rehomogenization of the flow. We discuss the relation between the apparent stick-slip in our continuum model with similar behavior in "true" wall slip. * d.j.read@leeds.ac.uk

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Polymer Melt Fracture

Cited by 34 publications

References 0 publications

Flow property at capillary extrusion for ethylene–tetrafluoroethylene copolymer

Flow property at capillary extrusion for ethylene–tetrafluoroethylene copolymer

Multi-scale Modeling and Simulation of Polymer Flow

Periodic “stick-slip” transition within a continuum model for entangled supramolecular polymers

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