Wall slip and shear stresses of polymer melts at high shear rates without pressure and viscous heating effects

Awati K.M., Park Y., Weisser E. and MacKay M.E. (2000) Wall slip and shear stresses of polymer melts at high shear rates without pressure and viscous heating effects. Journal of Non-Newtonian Fluid Mechanics, 89 1-2: 117-131. doi:10.1016/S0377-0257(99)00037-3


Author Awati K.M.
Park Y.
Weisser E.
MacKay M.E.
Title Wall slip and shear stresses of polymer melts at high shear rates without pressure and viscous heating effects
Journal name Journal of Non-Newtonian Fluid Mechanics   Check publisher's open access policy
ISSN 0377-0257
Publication date 2000-01-01
Sub-type Article (original research)
DOI 10.1016/S0377-0257(99)00037-3
Open Access Status
Volume 89
Issue 1-2
Start page 117
End page 131
Total pages 15
Publisher Elsevier Science Publishers B.V.
Language eng
Subject 1507 Transportation and Freight Services
Abstract We present experimental data demonstrating wall slip of high temperature polymer melts at high shear rates (up to ~70 s) without pressure and viscous heating effects. Results for polydisperse (linear low density polyethylene) and monodisperse (polystyrene) melts are presented. For the monodisperse case two distinct regimes of slip are seen: (1) a low shear rate regime in which the slip velocity increases slowly with shear rate (weak slip) and (2) a high shear rate regime in which the increase is dramatic (strong slip). Through scaling of our shear stress/shear rate data we demonstrate that the crossover between the two regimes occurs when the bulk polymer chains are effectively disentangled. These findings are in qualitative agreement with molecular models of slip which invoke an entanglement-disentanglement scenario for the transition from weak to strong slip. The polydisperse system shows less critical slip behaviour and the slip velocity increases; yet, the increase is less dramatic than the monodisperse system. (C) 2000 Elsevier Science B.V. All rights reserved.
Keyword Convective constraint release
Entanglements
Polymer melt
Slip
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 12 Jul 2016, 11:43:45 EST by System User