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Melt fracture and wall slip of metallocene-catalyzed bimodal polyethylenes in capillary flow
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10.1122/1.4774397
/content/sor/journal/jor2/57/2/10.1122/1.4774397
http://aip.metastore.ingenta.com/content/sor/journal/jor2/57/2/10.1122/1.4774397

Figures

Image of FIG. 1.
FIG. 1.

MWD curves of the PE resins obtained from SEC.

Image of FIG. 2.
FIG. 2.

Magnitude of complex viscosity |η*| as a function of frequency obtained from the dynamic frequency sweep test at 190 °C.

Image of FIG. 3.
FIG. 3.

Steady-state shear stress as a function of shear rate obtained from the capillary extrusion test (solid symbols) and magnitude of complex modulus |G*| as a function of frequency measured from the dynamic frequency sweep test (open symbols) for CP (unimodal PE). The inset shows the pressure oscillation at the stick-slip transition.

Image of FIG. 4.
FIG. 4.

Optical micrographs of the extrudates obtained for CP (unimodal PE) at different shear rates and stresses. (a) 61.1 s−1, 133 kPa; (b) 84.2 s−1, 154 kPa; (c) 115 s−1, 177 kPa; (d) 157 s−1, 201 kPa; (e) 296 s−1, 254 kPa; (f) 797 s−1, 342 kPa; (g) stick-slip at 1380 s−1, 360 ∼ 350 kPa; (h) 7470 s−1, 374 kPa.

Image of FIG. 5.
FIG. 5.

Steady-state shear stress as a function of shear rate obtained from the capillary extrusion test (solid symbols) and magnitude of complex modulus |G*| as a function of frequency measured from the dynamic frequency sweep test (open symbols) for L1H3 bimodal PE. The inset shows the pressure oscillation at the stick-slip transition.

Image of FIG. 6.
FIG. 6.

Optical micrographs of the extrudates obtained for L1H3 (bimodal PE) at different shear rates and stresses. (a) 4.09 s−1, 102 kPa; (b) 5.42 s−1, 118 kPa; (c) 7.52 s−1, 137 kPa; (d) 11.2 s−1, 158 kPa; (e) 20.7 s−1, 189 kPa; (f) 70.8 s−1, 227 kPa; (g) stick-slip at 103 s−1, 225 ∼ 190 kPa; (h) 3670 s−1, 216 kPa.

Image of FIG. 7.
FIG. 7.

Steady-state shear stress as a function of shear rate obtained from the capillary extrusion test (solid symbols) and magnitude of complex modulus |G*| as a function of frequency measured from the dynamic frequency sweep test (open symbols) for (a) L2H2 and (b) L3H1 bimodal PE. The inset shows the pressure oscillation at the stick-slip transition.

Image of FIG. 8.
FIG. 8.

Optical micrographs of the extrudates obtained for L2H2 (bimodal PE) at different shear rates and stresses. (a) 4.22 s−1, 94.4 kPa; (b) 5.68 s−1, 96.9 kPa; (c) 12.5 s−1, 115 kPa; (d) 42 s−1, 141 kPa; (e) 56.8 s−1, 153 kPa; (f) 76.4 s−1, 169 kPa; (g) 190 s−1, 218 kPa; (h) stick-slip at 644 s−1, 232–229 kPa.

Image of FIG. 9.
FIG. 9.

Optical micrographs of the extrudates obtained for L3H1 (bimodal PE) at different shear rates and stresses. (a) 4.38 s−1, 58.2 kPa; (b) 7.9 s−1, 62.4 kPa; (c) 14 s−1, 67.1 kPa; (d) 19.4 s−1, 72.6 kPa; (e) 25.6 s−1, 78.8 kPa; (f) 46 s−1, 95.5 kPa; (g) 60.2 s−1, 103 kPa; (h) stick-slip at 605 s−1, 157 kPa.

Image of FIG. 10.
FIG. 10.

Slip velocity versus shear stress for three bimodal resins, L1H3, L2H2, and L3H1.

Tables

Generic image for table
TABLE I.

Molecular weight characteristics of the PE resins.

Generic image for table
TABLE II.

Onset stresses of melt fractures and plateau moduli for the PE resins.

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/content/sor/journal/jor2/57/2/10.1122/1.4774397
2013-01-10
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Melt fracture and wall slip of metallocene-catalyzed bimodal polyethylenes in capillary flow
http://aip.metastore.ingenta.com/content/sor/journal/jor2/57/2/10.1122/1.4774397
10.1122/1.4774397
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