Quantitative prediction of transient and steady-state elongational viscosity of nearly monodisperse polystyrene melts

Abstract

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Experimental validation of a tube based constitutive equation for linear polymer melts with inter-chain tube pressure effect

“…Such behaviour was only predicted by previous models using unrealistically low values of the chain finite extensibility parameter [1,15]. A further model of interchain tube pressure effect was then proposed by Marrucci and Ianniruberto [17] to explain Bach et al [16] results, followed by macroscopic constitutive equations from Wagner et al [18] and Dhole et al [1] that were able to quantitatively predict them. The present study aimed at checking the validity of the model of Dhole et al in both rheometrical and complex flows, for a polydisperse polystyrene melt.…”

Mechanism of spontaneous hole formation in thin polymeric films

“…It initially consists of a 60-nm-thick polymeric film of a 390 kg/mole polystyrene, where we use a value of τ w /3 = 0.035τ max . 13,23 All material parameters can be found in Wagner et al 13 and Bach et al 23 After a time delay, the initial disturbance gradually evolves and the local thickness goes toward zero, which by definition is the critical point in time where the hole develops. Only one hole develops from a disturbance, and the surface remains flat between the holes.…”

“…de Gennes. 12 While the original Doi and Edwards model 11 has many limitations, Wagner et al 13 added a stretch equation based on the "interchain pressure" concept. 14 This approach is currently the most accurate model to predict the flow behavior of monodisperse polymer melts.…”

“…14 This approach is currently the most accurate model to predict the flow behavior of monodisperse polymer melts. 13,15,16 The analytical model is…”

Rheological Characterization and Constitutive Modeling of Two LDPE Melts

“…More recent developments of the MSF model for linear and branched monodisperse polystyrene melts [6][7][8] have shown that for modeling of monodisperse melts an application of only one nonlinear parameter is sufficient. This parameter, the so-called tube diameter relaxation time a W , represents the relaxation of the topological constraint caused by many surrounding chains.…”