Molecular transitions and dynamics at polymer/wall interfaces: origins of flow instabilities and wall slip

SQ Wang - Polymers in confined environments, 1999 - Springer
This article reviews recent results on capillary melt flow anomalies. Long standing
controversies and debates in this field are illustrated by summarizing previous results and …

Role of processing aids in the extrusion of molten polymers

EC Achilleos, G Georgiou… - Journal of Vinyl and …, 2002 - Wiley Online Library
Product quality and, in general, processing windows and rates of production in the extrusion
of molten polymers are limited by various flow instabilities (mainly melt fracture) that are …

Slip mechanisms in complex fluid flows

SG Hatzikiriakos - Soft Matter, 2015 - pubs.rsc.org
The classical no-slip boundary condition of fluid mechanics is not always a valid assumption
for the flow of several classes of complex fluids including polymer melts, their blends …

Stick and slip phenomena during extrusion of polyethylene melts as investigated by laser-Doppler velocimetry

H Münstedt, M Schmidt, E Wassner - Journal of Rheology, 2000 - pubs.aip.org
The flow behavior of polyethylene melts in a slit die was investigated using laser-Doppler
velocimetry. Two polyethylenes, a linear and a long-chain branched sample, were …

Rheological properties of two polypropylenes with different molecular structure

S Kurzbeck, F Oster, H Münstedt, TQ Nguyen… - Journal of …, 1999 - pubs.aip.org
Two polypropylenes with different molecular structure were investigated in shear and
elongational flow. One resin is an ethylene–propylene copolymer with linear molecules and …

Polymer processing extrusion instabilities and methods for their elimination or minimisation

JF Agassant, DR Arda, C Combeaud… - International Polymer …, 2006 - degruyter.com
This paper presents and reviews findings in relation to three key areas where polymer
processing instabilities occur. The paper also describes methods that can be utilised to …

Complex ink flow mechanisms in micro-direct-ink-writing and their implications on flow rate control

KT Estelle, BA Gozen - Additive Manufacturing, 2022 - Elsevier
Despite its simplicity, low cost, and ability to process a wide range of materials, direct-ink-
writing (DIW) is an additive manufacturing process with low resolution and accuracy, in the …

Wall slip and extrudate distortion of three polymer melts

DM Kalyon, H Gevgilili - Journal of Rheology, 2003 - pubs.aip.org
A high-density polyethylene (HDPE), a poly (dimethylsiloxane)(PDMS), and an oxetane
based alternating block thermoplastic elastomer (TPE) were subjected to steady torsional …

Interfacial slip violations in polymer solutions: Role of microscale surface roughness

J Sanchez-Reyes, LA Archer - Langmuir, 2003 - ACS Publications
Violations of the no-slip hydrodynamic boundary condition are investigated in polymer
solutions using gap-dependent shear flow measurements between parallel plates. Solutions …

Stick-slip flow of high density polyethylene in a transparent slit die investigated by laser Doppler velocimetry

L Robert, Y Demay, B Vergnes - Rheologica Acta, 2004 - Springer
The oscillating flow instability of a molten linear high-density polyethylene is carefully
studied using a single screw extruder equipped with a transparent slit die. Experiments are …