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Verification of branch point withdrawal in elongational flow of pom-pom polystyrene melt
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10.1122/1.2957699
/content/sor/journal/jor2/52/5/10.1122/1.2957699
http://aip.metastore.ingenta.com/content/sor/journal/jor2/52/5/10.1122/1.2957699

Figures

Image of FIG. 1.
FIG. 1.

Linear viscoelastic master curves at for the pom-pom PS melt. Open circles are the loss modulus and closed circles the storage modulus . Lines represent the fit obtained for a discrete relaxation spectrum with eight modes (Table I).

Image of FIG. 2.
FIG. 2.

Van-Gurp-Palmen plot, i.e., loss angle as a function of complex modulus , of a linear monodisperse PS melt with [Bach et al. (2003)] (closed circles) and the pom-pom PS melt (open circles).

Image of FIG. 3.
FIG. 3.

Comparison of measured elongational viscosity data of the pom-pom PS melt at to predictions of an eight-mode pom-pom model. (Solid lines for , dotted lines at for and 3, respectively.) Lower dotted line corresponds to the linear-viscoelastic start-up viscosity.

Image of FIG. 4.
FIG. 4.

Strain measure data (symbols) of the pom-pom PS melt at compared to predictions of strain measures describing affine stretch based on (a) the DE tensor (dotted line), (b) the DE tensor with independent alignment assumption (solid line), and (c) affine tube squeeze (dashed dotted line).

Image of FIG. 5.
FIG. 5.

Comparison of measured elongational viscosity data of the pom-pom PS melt at to predictions of MSF model with [Eq. (29)]. Lower dotted line corresponds to the linear-viscoelastic start-up viscosity.

Image of FIG. 6.
FIG. 6.

Comparison of measured elongational viscosity data of the pom-pom PS melt at to predictions of MSF model considering dynamic dilution of the backbone (dotted lines), and dynamic dilution and finite extensibility (solid lines). Lower dotted line corresponds to the linear-viscoelastic start-up viscosity.

Image of FIG. 7.
FIG. 7.

Comparison of measured elongational viscosity data of the pom-pom PS melt at to predictions of MSF model considering dynamic dilution, finite extensibility and stretch relaxation. Lower dotted line corresponds to the linear-viscoelastic start-up viscosity.

Image of FIG. 8.
FIG. 8.

Comparison of measured elongational viscosity data of the pom-pom PS melt at to predictions of MSF model considering dynamic dilution, finite extensibility, stretch relaxation, and branch point withdrawal. Lower dotted line corresponds to the linear-viscoelastic start-up viscosity.

Image of FIG. 9.
FIG. 9.

Strain measure data (symbols) of the pom-pom PS melt at compared to predictions (thin solid lines) of MSF model considering dynamic dilution, finite extensibility, stretch relaxation and branch point withdrawal. Strain measures describing stretch based on (a) the DE tensor are indicated by dotted line, (b) the DE tensor with independent alignment assumption by thick solid line, and (c) affine tube squeeze by dashed dotted line.

Tables

Generic image for table
TABLE I.

Molecular characterization and relaxation spectrum of pom-pom PS melt at .

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/content/sor/journal/jor2/52/5/10.1122/1.2957699
2008-09-01
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Verification of branch point withdrawal in elongational flow of pom-pom polystyrene melt
http://aip.metastore.ingenta.com/content/sor/journal/jor2/52/5/10.1122/1.2957699
10.1122/1.2957699
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