Studies on elongational viscosity of polymer melts (abstract)

1992 ◽  
Vol 36 (5) ◽  
pp. 979-979
Author(s):  
Kiyohito Koyama
Keyword(s):  
Polymer Melts ◽  
Elongational Viscosity

Rheotens-mastercurves and elongational viscosity of polymer melts

1996 ◽  
Vol 35 (2) ◽  
pp. 117-126 ◽  
Author(s):  
Manfred H. Wagner ◽  
Bertrand Collignon ◽  
J�r�me Verbeke
Keyword(s):  
Polymer Melts ◽  
Elongational Viscosity

Equibiaxial elongational viscosity measurements of commercial polymer melts

2014 ◽  
Vol 55 (5) ◽  
pp. 1012-1017 ◽  
Author(s):  
Rebecca M. Mick ◽  
Tai-Yi Shiu ◽  
David C. Venerus
Keyword(s):  
Polymer Melts ◽  
Elongational Viscosity ◽  
Viscosity Measurements

scholarly journals Reliability Engineering. Measurement of Biaxial Elongational Viscosity of Polymer Melts Using Lubricated Squeezing Flow Method.

1998 ◽  
Vol 47 (12) ◽  
pp. 1296-1300 ◽  
Author(s):  
Akihiro NISHIOKA ◽  
Yasuyuki TAKAGI ◽  
Tatsuhiro TAKAHASHI ◽  
Yuichi MASUBUCHI ◽  
Jun-ichi TAKIMOTO ◽  
...  
Keyword(s):  
Polymer Melts ◽  
Elongational Viscosity ◽  
Squeezing Flow ◽  
Reliability Engineering ◽  
Flow Method ◽  
Engineering Measurement ◽  
Lubricated Squeezing Flow

An investigation on modelling and measurements of transient elongational rheology of polymer melts by SER testing platform

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Mahmoud Rajabian ◽  
Ghassem Naderi ◽  
Hamid Piroozfar ◽  
Mohammad H. Beheshty ◽  
Mohammad Samadfam
Keyword(s):  
Steady State ◽  
Simple Shear ◽  
Shear Flows ◽  
Polymer Melts ◽  
Elongational Viscosity ◽  
Extensional Viscosity ◽  
Molten State ◽  
Diffusion Term ◽  
Hencky Strain ◽  
Elongational Rheology

AbstractTransient elongational rheology of PP is investigated experimentally. A specifically designed fixture consisting of two drums mounted on a TA Instruments ARES rotational rheometer was used to measure the transient uniaxial extensional viscosity of two commercial grades polypropylene in the molten state. The Hencky strain was varied from 0.003 to 2 s-1 and the temperature was fixed at 180 oC. The measurements show that the steady state elongational viscosity was reached at the measured Hencky strains for polypropylene. Eslami and Grmela have recently introduced a reptation diffusion term arising from the intermolecular chain forces into the rigid FENE-P dumbbells model. The same approach has been used in this study to interpret the transient rheological data in both shear-free and simple shear flows.

scholarly journals Elongational viscosity scaling of polymer melts with different chemical constituents

2021 ◽  
Vol 60 (4) ◽  
pp. 163-174
Author(s):  
Esmaeil Narimissa ◽  
Leslie Poh ◽  
Manfred H. Wagner
Keyword(s):  
Power Law ◽  
Molar Mass ◽  
Polymer Melts ◽  
Chemical Constituents ◽  
Elongational Flow ◽  
Weissenberg Number ◽  
Elongational Viscosity ◽  
Viscosity Data ◽  
Strain And Strain Rate ◽  
Linear Viscoelastic

AbstractMorelly et al. (Macromolecules 52:915-922, 2019) reported transient and steady-state elongational viscosity data of monodisperse linear polymer melts obtained by filament-stretching rheometry with locally controlled strain and strain rate and found different power law scaling of the elongational viscosities of polystyrene, poly(tert-butylstyrene) and poly(methyl-methacrylate). Very good agreement is achieved between data and predictions of the extended interchain pressure (EIP) model (Narimissa et al. J. Rheol. 64, 95-110 (2020)), based solely on linear viscoelastic characterization and the Rouse time τR of the melts. The analysis reveals that both the normalized elongational viscosity and the normalized elongational stress are dependent on the number of entanglements (Z) and the ratio of entanglement molar mass Mem to critical molar mass Mcm of the melts in the linear viscoelastic regime through $$ {\eta}_E^0/\left({G}_N{\tau}_R\right)\propto {\left({M}_{\mathrm{em}}/{M}_{\mathrm{cm}}\right)}^{2.4}{Z}^{1.4} $$ η E 0 / G N τ R ∝ M em / M cm 2.4 Z 1.4 and $$ {\sigma}_E^0/{G}_N\propto {\left({M}_{\mathrm{em}}/{M}_{\mathrm{cm}}\right)}^{2.4}{Z}^{1.4} Wi $$ σ E 0 / G N ∝ M em / M cm 2.4 Z 1.4 W i , while in the limit of fast elongational flow with high Weissenberg number $$ Wi={\tau}_R\dot{\varepsilon} $$ Wi = τ R ε ̇ , both viscosity and stress become independent of Z and Mem/Mcm, and approach a scaling which depends only on Wi, i.e. ηE/(GNτR) ∝ Wi−1/2 and σE/GN ∝ Wi1/2. When expressed by an effective power law, the broad transition from the linear viscoelastic to the high Wi regime leads to chemistry-dependent scaling at intermediate Wi depending on the number of entanglements and the ratio between entanglement molar mass and critical molar mass.

scholarly journals Elongational Viscosity Measurements on Polymer Melts by a Meissner-type Rheometer

1988 ◽  
Vol 16 (3) ◽  
pp. 117-124 ◽  
Author(s):  
Lin Li ◽  
Toshiro MASUDA ◽  
Masaoki TAKAHASHI ◽  
Hideki OHNO
Keyword(s):  
Polymer Melts ◽  
Elongational Viscosity ◽  
Viscosity Measurements
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