Fig. 4: Extensional viscosity, SHF and the phase angle from shear as a function of Deborah and Weissenberg number. | Nature Communications

Fig. 4: Extensional viscosity, SHF and the phase angle from shear as a function of Deborah and Weissenberg number.

From: Predicting maximum strain hardening factor in elongational flow of branched pom-pom polymers from polymer architecture

Fig. 4

a) Extensional viscosity \({\eta }_{E}\) normalized by three times the zero-shear viscosity \({\eta }_{0}\) shown as a function of the Weissenberg number \({Wi}\) and the phase angle δ as a function of the Deborah number \({De}\) of the pom-pom 280k-2x22-22k. Different yellow symbols represent measurement temperatures: square 220 °C, circle 200 °C, upwards triangle 180 °C, downwards triangle 160 °C, rhombus 150 °C, and leftwards triangle 130 °C. Black lines are drawn as a guide for the eyes. b) Experimental strain hardening factor \({SHF}\) as a function of \({Wi}\) and δ as a function of \({De}\) of the pom-pom 280k-2×22-22k. The maximum reachable strain hardening factor can be predicted by assuming \({{SHF}}_{\max }\) = \({f}_{c}\) = 133 for pom-pom topology. Blue line is as a guide to the eye.

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