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Constriction flows of monodisperse linear entangled polymers: Multiscale modeling and flow visualization

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Figure

TABLE I. Labels and descriptions of materials used in this study.
FIG. 1. �a� Schematic layout of MPR and �b� cross section of slit flow cell.
FIG. 2. Linear rheology of �a� 250k �filled symbols� and 485k PS �open symbols� melts and �b� PB 48�squares�, 156 �triangles�, and 210k �circles� melts with comparison to predictions from the tube theory, pa-rameterized by a chemistry- and temperature-dependent entanglement modulus Ge and Rouse relaxation time ofan entanglement segment �e, and the material dependent number of entanglements Z.
FIG. 3. Nonlinear shear and extensional �485k PS only� transients �rates from 0.01–3 s−1� rheology of 250k �a�and 485k PS �b� melts at 170 °C �the extensional data were time-temperature shifted from 160 °C�
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