Extensional rheometry of polymer multilayers: A sensitive probe of interfaces

1997 ◽  
Vol 41 (3) ◽  
pp. 671-685 ◽  
Author(s):  
Leon Levitt ◽  
Christopher W. Macosko ◽  
Thomas Schweizer ◽  
Joachim Meissner
Keyword(s):  
Extensional Rheometry

scholarly journals Extensional rheometry of model liquids: Simulations of filament stretching

2021 ◽  
Vol 33 (12) ◽  
pp. 123108
Author(s):  
Ole Hassager ◽  
Yanwei Wang ◽  
Qian Huang
Keyword(s):  
Filament Stretching ◽  
Extensional Rheometry

Addendum: Rotary Clamp in Uniaxial and Biaxial Extensional Rheometry of Polymer Melts [J. Rheol., 25 1 (1981)]

1981 ◽  
Vol 25 (6) ◽  
pp. 673-674 ◽  
Author(s):  
J. Meissner ◽  
T. Raible ◽  
S. E. Stephenson
Keyword(s):  
Polymer Melts ◽  
Extensional Rheometry

scholarly journals Enhanced Foamability with Shrinking Microfibers in Linear Polymer

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 211 ◽  
Author(s):  
Eric Kim ◽  
Heon Park ◽  
Carlos Lopez-Barron ◽  
Patrick Lee
Keyword(s):  
Strain Hardening ◽  
Polymer Processing ◽  
Expansion Ratio ◽  
Low Frequencies ◽  
Extensional Rheometry ◽  
Enhanced Strain ◽  
Linear Viscoelastic ◽  
Cost Efficient ◽  
Strain Hardening Behavior

Strain hardening has important roles in understanding material structures and polymer processing methods, such as foaming, film forming, and fiber extruding. A common method to improve strain hardening behavior is to chemically branch polymer structures, which is costly, thus preventing users from controlling the degree of behavior. A smart microfiber blending technology, however, would allow cost-efficient tuning of the degree of strain hardening. In this study, we investigated the effects of compounding polymers with microfibers for both shear and extensional rheological behaviors and characteristics and thus for the final foam morphologies formed by batch physical foaming with carbon dioxide. Extensional rheometry showed that compounding of in situ shrinking microfibers significantly enhanced strain hardening compared to compounding of nonshrinking microfibers. Shear rheometry with linear viscoelastic data showed a greater increase in both the loss and storage modulus in composites with shrinking microfibers than in those with nonshrinking microfibers at low frequencies. The batch physical foaming results demonstrated a greater increase in the cell population density and expansion ratio with in situ shrinking microfibers than with nonshrinking microfibers. The enhancement due to the shrinkage of compounded microfibers decreasing with temperature implies that the strain hardening can be tailored by changing processing conditions.

Rotary Clamp in Uniaxial and Biaxial Extensional Rheometry of Polymer Melts

1981 ◽  
Vol 25 (1) ◽  
pp. 1-28 ◽  
Author(s):  
J. Meissner ◽  
T. Raible ◽  
S. E. Stephenson
Keyword(s):  
Polymer Melts ◽  
Extensional Rheometry

Extensional rheometry of magnetic dispersions

2015 ◽  
Vol 59 (1) ◽  
pp. 193-209 ◽  
Author(s):  
F. J. Galindo-Rosales ◽  
J. P. Segovia-Gutiérrez ◽  
F. T. Pinho ◽  
M. A. Alves ◽  
J. de Vicente
Keyword(s):  
Extensional Rheometry ◽  
Magnetic Dispersions

Long-Chain Branching in Metallocene-Catalyzed Polyethylenes Investigated by Low Oscillatory Shear and Uniaxial Extensional Rheometry

2002 ◽  
Vol 35 (3) ◽  
pp. 1038-1048 ◽  
Author(s):  
Anneli Malmberg ◽  
Claus Gabriel ◽  
Thomas Steffl ◽  
Helmut Münstedt ◽  
Barbro Löfgren
Keyword(s):  
Oscillatory Shear ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Extensional Rheometry ◽  
Long Chain

scholarly journals Inhomogeneous transient uniaxial extensional rheometry

2002 ◽  
Vol 46 (6) ◽  
pp. 1419-1443 ◽  
Author(s):  
Jonathan P. Rothstein ◽  
Gareth H. McKinley
Keyword(s):  
Extensional Rheometry

Extensional rheometry of fluid S1

1994 ◽  
Vol 52 (2) ◽  
pp. 153-162 ◽  
Author(s):  
Y.W. Ooi ◽  
T. Sridhar
Keyword(s):  
Extensional Rheometry

Dripping-onto-substrate capillary breakup extensional rheometry of low-viscosity printing inks

2019 ◽  
Vol 266 ◽  
pp. 160-170 ◽  
Author(s):  
Maxime Rosello ◽  
Samrat Sur ◽  
Bruno Barbet ◽  
Jonathan P. Rothstein
Keyword(s):  
Capillary Breakup ◽  
Low Viscosity ◽  
Extensional Rheometry ◽  
Printing Inks

scholarly journals Using Computational Modelling to Study Extensional Rheometry Tests for Inelastic Fluids

Fluids ◽  
2021 ◽  
Vol 6 (12) ◽  
pp. 464
Author(s):  
Mohammadreza Aali ◽  
Célio Fernandes ◽  
Olga Sousa Carneiro ◽  
João Miguel Nóbrega
Keyword(s):  
Test Temperature ◽  
Computational Modelling ◽  
Extensional Viscosity ◽  
Computational Domain ◽  
Numerical Predictions ◽  
Extensional Rheometry ◽  
Significant Difference ◽  
Order Of Magnitude ◽  
Definition Of ◽  
Selection Of

The present work focuses on the extensional rheometry test, performed with the Sentmanat extensional rheometer (SER) device, and its main objectives are: (i) to establish the modelling requirements, such as the geometry of the computational domain, initial and boundary conditions, appropriate case setup, and (ii) to investigate the effect of self-induced errors, namely on the sample dimensions and test temperature, on the extensional viscosity obtained through the extensional rheometry tests. The definition of the modelling setup also comprised the selection of the appropriate mesh refinement level to model the process and the conclusion that gravity can be neglected without affecting the numerical predictions. The subsequent study allowed us to conclude that the errors on the sample dimensions have similar effects, originating differences on the extensional viscosity proportional to the induced variations. On the other hand, errors of a similar order of magnitude on the test temperature promote a significant difference in the predicted extensional viscosity.

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