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Stress relaxation and reversed flow of low-density polyethylene melts following uniaxial extension
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10.1122/1.4752759
/content/sor/journal/jor2/56/6/10.1122/1.4752759
http://aip.metastore.ingenta.com/content/sor/journal/jor2/56/6/10.1122/1.4752759

Figures

Image of FIG. 1.
FIG. 1.

Contour of the Lupolen 3020D filament at different Hencky strain values during a uniaxial stretching at 130 °C with .

Image of FIG. 2.
FIG. 2.

Hencky strain of the Lupolen 3020D samples measured by the FSR at 130 °C as a function of time t. The startup of the flow is uniaxial elongation with ; the flow was stopped at , and 4.5, respectively.

Image of FIG. 3.
FIG. 3.

Quenched Lupolen 3020D filament. The flow was stopped at () and relaxed for 100 s.

Image of FIG. 4.
FIG. 4.

Quenched Lupolen 1840D filament. The flow was stopped at () and relaxed for 100 s.

Image of FIG. 5.
FIG. 5.

Contour scanned by the laser micrometer of the quenched Lupolen 3020D filament delimited by the red square in Fig. 3. The flow was stopped at () and relaxed for 100 s.

Image of FIG. 6.
FIG. 6.

Contour scanned by the laser micrometer of the quenched Lupolen 1840D filament delimited by the red square in Fig. 4. The flow was stopped at () and relaxed for 100 s.

Image of FIG. 7.
FIG. 7.

Contour of the Lupolen 1840D filament at different Hencky strain values during a uniaxial stretching with followed by a reversed biaxial flow with at 130 °C. The flow was reversed at .

Image of FIG. 8.
FIG. 8.

Hencky strain of Lupolen 1840D samples measured by FSR at 130 °C as a function of the time t. The startup of the flow was uniaxial elongation with . The flow was reversed at , and 4.5, respectively, with the identical strain rate .

Image of FIG. 9.
FIG. 9.

The corrected extensional stress of Lupolen 3020D as a function of time at 130 °C with (Wi = 19.1). The flow was stopped at an extension of , and 4.5, respectively. The dashed and solid lines are the corresponding DE predictions with and without IAA, respectively.

Image of FIG. 10.
FIG. 10.

The corrected extensional stress of Lupolen 1840D as a function of time at 130 °C with (Wi = 5.2). The flow was stopped at an extension of , and 4.5, respectively. The dashed and solid lines are the corresponding DE predictions with and without IAA, respectively.

Image of FIG. 11.
FIG. 11.

Comparison of the raw data and the data after wave processing for Lupolen 1840D (, ) at 130 °C.

Image of FIG. 12.
FIG. 12.

The average relaxation time in extensional stress decay of Lupolen 3020D and 1840D as a function of Hencky strain at 130 °C.

Image of FIG. 13.
FIG. 13.

The corrected startup and reversed stress of Lupolen 3020D at 130 °C as a function of Hencky strain. The startup of the flow was uniaxial elongation with (Wi = 19.1). The flow was reversed at , and 5.0, respectively, with the identical strain rate . The solid lines are the corresponding rigorous DE predictions.

Image of FIG. 14.
FIG. 14.

The corrected startup and reversed stress of Lupolen 1840D at 130 °C as a function of Hencky strain. The startup of the flow was uniaxial elongation with (Wi = 5.2). The flow was reversed at , and 4.5, respectively, with the identical strain rate . The solid lines are the corresponding rigorous DE predictions.

Image of FIG. 15.
FIG. 15.

The strain recovery as a function of Hencky strain for Lupolen 3020D (, Wi = 19.1) and 1840D (, Wi = 5.2) at 130 °C. The lines are the rigorous DE predictions.

Image of FIG. 16.
FIG. 16.

The strain recovery as a function of Hencky strain for Lupolen 3020D at 130 °C with different strain rates (Wi = 6.4, 19.1, 63.7). The dashed and solid lines are the corresponding DE predictions with and without IAA, respectively.

Image of FIG. 17.
FIG. 17.

Comparison of the measured extensional stress growth coefficient for Lupolen 3020D with the pom-pom model, the interchain pressure model and the linear viscoelastic (LVE) prediction, at strain rates (from right to left) (Wi = 1.9, 6.4, 19.1, 63.7, 191.0) at 130 °C. The fitting parameters are listed in Table II. The experimental data are obtained from Rasmussen et al. (2005).

Image of FIG. 18.
FIG. 18.

Comparison of the measured stress relaxation for Lupolen 3020D at 130 °C with the pom-pom model and the interchain pressure model, at strain rate (Wi = 19.1) in the startup. The fitting parameters are listed in Table II.

Image of FIG. 19.
FIG. 19.

Comparison of the measured strain recovery for Lupolen 3020D with the pom-pom model, the interchain pressure model, and the rigorous DE model at 130 °C at strain rate (Wi = 19.1). The fitting parameters are listed in Table II.

Image of FIG. 20.
FIG. 20.

Comparison of the measured strain recovery with the multi mode interchain pressure prediction for Lupolen 3020D at 130 °C at different strain rates (Wi = 6.4, 19.1, 63.7). The fitting parameters are listed in Table II.

Tables

Generic image for table
TABLE I.

Properties of the Lupolen 3020D and Lupolen 1840D LDPE melts. Linear viscoelastic spectrum from Bastian (2001) for Lupolen 3020D (130 °C) and Rasmussen et al. (2005) for Lupolen 1840D (130 °C).

Generic image for table
TABLE II.

Fitting parameters used in the multi mode pom-pom model and the multi mode interchain pressure model for the Lupolen 3020D melt at 130 °C.

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/content/sor/journal/jor2/56/6/10.1122/1.4752759
2012-09-21
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Stress relaxation and reversed flow of low-density polyethylene melts following uniaxial extension
http://aip.metastore.ingenta.com/content/sor/journal/jor2/56/6/10.1122/1.4752759
10.1122/1.4752759
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