Time‐dependent capillary flow of polystyrene

Rudin, Alfred; Leeder, D. R.

doi:10.1002/app.1968.070121008

Cited by 6 publications

References 27 publications

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Polymer flow through capillaries of variable diameter

Chee¹,

Yap²,

Rudin³

1976

J of Applied Polymer Sci

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SynopsisA polystyrene melt has been extruded through successive capillaries arranged to produce converging and diverging flow patterns through the twin orifices. Applied pressure at fixed mass flow rate through the combined dies is equal to the sum of the pressure drops in the single capillaries in both flow modes. The Bagley end correction was found to apply to each die in the sequence. Bagley plots were linear with a particular upper capillary a t given apparent shear rate in the lower die. No effect of shear history could be detected on the viscous behavior of the polymer, but preshearing in converging flow produced a slight reduction in die swell.

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Polymer flow through capillaries of variable diameter

Chee¹,

Yap²,

Rudin³

1976

J of Applied Polymer Sci

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Flow analysis and end corrections in falling coaxial cylinder viscometry

Chee

Rudin

1976

Can J Chem Eng

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The assumptions involved in the analysis of flow of polymer melts in a closed end falling coaxial cylinder viscometer(1–3) are examined and it is shown that true values of shear rate and shear stress at the wall of the moving cylinder can be obtained by assuming classical Poiseuille flow. Flow curves obtained with a variety of apparatus geometries, driving loads and polymers are consistent with those of other measurement techniques. This apparatus, which is a simple modification of a capillary extrusion rheometer, provides measurements of apparent viscosity at much lower shear rates than can be obtained with the former viscometers. A quantitative measurement of end correction effects is provided by the present analysis. End effects, which are formally similar to those in capillary extrusion, were measured for several polystyrenes and polyethylenes.

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Fließverhalten und molekulare struktur von polymeren und ihren lösungen eine systematik quantitativer beziehungen

Hoffmann

1972

Makromol. Chem.

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ZUSAMMENFASSUNG:Viskositaten bei kleinen und hohen Schubspannungen, kritische Schubspannungen der Strukturviskositat, Gummimoduli verhakter Polymerer, Konzentrationen beginnender Verhakung und Grenzviskositatszahlen hangen von Strukturparametern in quantitativer (Molekulargewicht, Uneinheitlichkeit, Konzentration, chemische Natur bzw. Kettendicke) oder in bisher erst qualitativ erkannter Weise (verschiedene Verzweigung, chemische Uneinheitlichkeit, Sequenzstruktur, Phasentrennung und Kristallisation) ab.Mehrere neue Gesetze werden mitgeteilt. Alle Beziehungen sind starker untereinander verkniipft als bisher angenommen wurde und liefern einige phanomenologisch vergeblich gcsuchte Cesetze fiir das Verhalten von Mischungerl und Losungen. STJMMARY:For viscosities at low and high shear forces 7, critical shear forces T~ of the structural viscosity, YOUNG moduli in the rubbery region of the relaxation behaviour of entangled polymers, concentrations 'pf above which entanglements form a network, and intrinsic viscosities one may formulate quantitative relations to structural parameters (molecularweights M and their distribution, concentration, chemical nature, especially the molar volume V, of the structural unit) or at least qualitative ones (different types of branching, distribution of chemical composition, sequences of like structural units, heterogeneity as a consequence of phase separation, crystallinity). Several new quantitative relations are presented. These and the known relations are connected to each other much more, than has been formulated up t o now. They lead to some laws for the normal behaviour of mixtures and solutions which have not been detected phenomenologically.

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Time‐dependent capillary flow of polystyrene

Cited by 6 publications

References 27 publications

Polymer flow through capillaries of variable diameter

Polymer flow through capillaries of variable diameter

Flow analysis and end corrections in falling coaxial cylinder viscometry

Fließverhalten und molekulare struktur von polymeren und ihren lösungen eine systematik quantitativer beziehungen

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