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Viscosity overshoot in the start-up of uniaxial elongation of low density polyethylene melts
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10.1122/1.1849188
/content/sor/journal/jor2/49/2/10.1122/1.1849188
http://aip.metastore.ingenta.com/content/sor/journal/jor2/49/2/10.1122/1.1849188

Figures

Image of FIG. 1.
FIG. 1.

The uncorrected transient elongation viscosities of Lupolen 3020D measured at , using Eq. (3), shown as a function of the Hencky strain, . are measured at five different elongational rates as shown in the figure.

Image of FIG. 2.
FIG. 2.

The corrected transient elongation viscosities of Lupolen 3020D at , using Eq. (4), shown as a function of the time, . The measurements are the same as in Fig. 1. The line is the linear viscoelastic prediction of the transient elongational viscosity.

Image of FIG. 3.
FIG. 3.

The uncorrected transient elongation viscosities of Lupolen 1840D measured at , using Eq. (3), shown as a function of the Hencky strain, . are measured at three different elongational rates as shown in the figure.

Image of FIG. 4.
FIG. 4.

The corrected transient elongation viscosities of Lupolen 1840D at , using Eq. (4), shown as a function of the time, . The measurements are the same as in Fig. 3. The line is the linear viscoelastic prediction of the transient elongational viscosity.

Image of FIG. 5.
FIG. 5.

The uncorrected extensional stress, , divided with the absolute temperature, , as a function of the Hencky strain, of Lupolen 3020D melt. or are measured at and (the measurements are the same as in Fig. 1) and at and .

Image of FIG. 6.
FIG. 6.

Interpretation of reduction in stress in terms of Pom-Pom picture. At the maximum in stress, the arms contribute to the tension in the backbone. At steady state, the molecule becomes effectively a linear polymer without arms.

Image of FIG. 7.
FIG. 7.

The steady elongation viscosities, (× and ◻), and three times the steady shear viscosities, (+ and ∘), of Lupolen 1840D (◻ and ∘) and Lupolen 3020D (× and +), measured at , shown as a function of the elongation rate, , and shear rate , respectively.

Image of FIG. 8.
FIG. 8.

The strain function, defined in Eq. (A1), as a function of the Hencky strain, . The viscosity measurements, of Lupolen 3020D measured at , are used to calculate , from Eq. (A2) and from Fig. 1.

Tables

Generic image for table
TABLE I.

Characterization of the BASF Lupolen 1840D and 3020D polymer melts. Linear viscoelastic spectrum from Bastian (2001) for the Lupolen 3020D.

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/content/sor/journal/jor2/49/2/10.1122/1.1849188
2005-03-01
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Viscosity overshoot in the start-up of uniaxial elongation of low density polyethylene melts
http://aip.metastore.ingenta.com/content/sor/journal/jor2/49/2/10.1122/1.1849188
10.1122/1.1849188
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