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Experimental evaluation of the pseudotime principle for nonisothermal polymer flows
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10.1122/1.3610439
/content/sor/journal/jor2/55/5/10.1122/1.3610439
http://aip.metastore.ingenta.com/content/sor/journal/jor2/55/5/10.1122/1.3610439

Figures

Image of FIG. 1.
FIG. 1.

(a). Temperature (top) and extension stress (bottom) of start-up of extension ( at 115 °C) until r  = 3.0 followed by relaxation of the polystyrene. The crosses (×) are isothermal measurements at 115 °C during the whole procedure, while the bullets (•) represent the experiment with the temperature change from 115 to 120 °C displayed in the above temperature curve. The bullets (•) are shifted to the circles (○) by the use of the pseudotime equation based on the evolution of the temperature. The lines in the bottom figures are the theory of linear viscoelasticity as obtained from Rasmussen and Eriksson (2007). (b): The same type of experiment as (a), with a delayed temperature changed.

Image of FIG. 2.
FIG. 2.

Temperature (top) and extension stress (bottom) of start-up of extension ( at 120 °C) until ε r  = 3.0 followed by relaxation of the polystyrene. The crosses (×) are isothermal measurements at 120 °C during the whole procedure, while the bullets (•) represent the experiment with the temperature change from 120 to 130 °C displayed in above temperature curve. The bullets (•) are shifted to the circles (○) by the use of the pseudotime equation based on the evolution of the temperature. The line in the bottom figure is the theory of linear viscoelasticity as obtained from Rasmussen et al. (2005).

Image of FIG. 3.
FIG. 3.

Temperature (top) and extension stress (bottom) of start-up of extension ( at 130 °C) until r  = 3.0 followed by relaxation of the LDPE. The crosses (×) are isothermal measurements at 130 °C during the whole procedure, while the bullets (•) represent the experiment with the temperature change from 130 to 170 °C displayed in above temperature curve. The bullets (•) are shifted to the circles (○) by the use of the pseudotime equation based on the evolution of the temperature. The line in the bottom figure is the theory of linear viscoelasticity as obtained from Rasmussen et al. (2005).

Tables

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TABLE I.

Characterization of the polystyrene (Rasmussen and Eriksson, 2007) and polyethylene melts (Rasmussen et al., 2005).

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/content/sor/journal/jor2/55/5/10.1122/1.3610439
2011-07-20
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Experimental evaluation of the pseudotime principle for nonisothermal polymer flows
http://aip.metastore.ingenta.com/content/sor/journal/jor2/55/5/10.1122/1.3610439
10.1122/1.3610439
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