Elongational flow and melt-spinning instability of concentrated suspensions of small particles in polymer melts

1981 ◽  
Vol 26 (2) ◽  
pp. 579-589 ◽  
Author(s):  
James L. White ◽  
Hideho Tanaka
Keyword(s):  
Melt Spinning ◽  
Polymer Melts ◽  
Elongational Flow ◽  
Small Particles ◽  
Concentrated Suspensions

A Continuous Lubricated Squeezing Flow Technique to Study the Rheological Behavior of Polymer Melts in Equibiaxial Elongational Flow

2008 ◽  
Author(s):  
David Venerus ◽  
Teresita Guadarrama-Medina ◽  
Tai-Yi Shiu ◽  
Albert Co ◽  
Gary L. Leal ◽  
...  
Keyword(s):  
Rheological Behavior ◽  
Polymer Melts ◽  
Elongational Flow ◽  
Squeezing Flow ◽  
Lubricated Squeezing Flow

Non-Isothermal Effects in the Elongational Flow of Polymer Melts

Rheology ◽  
1980 ◽  
pp. 437-442
Author(s):  
D. Acierno ◽  
L. Dieli ◽  
F. P. La Mantia ◽  
G. Titomanlio
Keyword(s):  
Polymer Melts ◽  
Elongational Flow

Elongational flow of polymer melts

AIChE Journal ◽  
1972 ◽  
Vol 18 (3) ◽  
pp. 540-547 ◽  
Author(s):  
James F. Stevenson
Keyword(s):  
Polymer Melts ◽  
Elongational Flow

Uniaxial elongational flow of particle-filled polymer melts

1998 ◽  
Vol 42 (3) ◽  
pp. 697-709 ◽  
Author(s):  
J. Greener ◽  
J. R. G. Evans
Keyword(s):  
Polymer Melts ◽  
Elongational Flow ◽  
Filled Polymer

scholarly journals Recoverable Extensional Flow of Polymer Melts and Its Relevance for Processing

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1512
Author(s):  
Helmut Münstedt
Keyword(s):  
Polymer Melts ◽  
Extensional Flow ◽  
Elongational Flow ◽  
Fused Deposition Modelling ◽  
Extrudate Swell ◽  
Fused Deposition ◽  
Rigid Particles ◽  
Experimental Parameters ◽  
Slit Die

While the uniaxial elongational viscosity is widely investigated, and its relevance for processing is described in the literature, much less has been published on the recoverable extensional flow of polymer melts. This paper presents a short overview of the dependencies of the recoverable elongation on the molecular structure of a polymer, and on some experimental parameters. Its main focus lies on the discussion of processing operations and applications that are largely affected by the elastic components of elongational flow. The recoverable portions of stretched films are considered, and the exploitation of the shrinkage of films, due to the recovery of frozen recoverable deformations, and its role for applications are addressed. The analysis of measurements of velocity fields in the entry region of a slit die and results on the determination of the recoverable elongation from uniaxial experiments, according to the literature, lead to the conclusion of dominant elastic extensions. Considering these facts, the assumptions for Cogswell’s widely used method of determining elongational viscosities under processing conditions from entrance flow are not realistic. As examples of a direct application of extrudate swell from short dies for processing, pelletizing and fused deposition modelling within additive manufacturing are addressed. The special features of extrudate swell from short dies, and uniaxial recoverable elongation for a polymer filled with rigid particles in comparison to an immiscible polymer blend, are presented and discussed.

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