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We investigate the influence of controlled uniaxial extension on various flow induced phenomena in semidilute solutions of ultra high molecular weight polyethylene. Concentrations range from 9w% to 29w% and the choice of solvent is paraffin oil. The start-up extensional behavior is measured at various Hencky strain rates ε˙ and at two different temperatures (150∘C and 170∘C) well above the melting...
The role of die-swell in the stability of fiber spinning flow of entangled polymer melts is analyzed using the linear as well as finite amplitude stability analyses. The nonlinear extensional rheology of polymer is described by using the eXtended Pom–Pom (XPP) model which captures the strain hardening effect present in the realistic flows. The stability of the slender body fiber profile to axisymmetric...
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