Modelling elongational and shear rheology of two LDPE melts

0328827 - ÚH 2010 RIV DE eng J - Článek v odborném periodiku
Rolón-Garrido, V. H. - Pivokonský, Radek - Filip, Petr - Zatloukal, M. - Wagner, M. H.
Modelling elongational and shear rheology of two LDPE melts.
[Modelování elongační a smykové viskozity dvou LDPE tavenin.]
Rheologica Acta. Roč. 48, č. 6 (2009), s. 691-697. ISSN 0035-4511. E-ISSN 1435-1528
Grant CEP: GA AV ČR IAA200600703
Výzkumný záměr: CEZ:AV0Z20600510
Klíčová slova: Rheology * MSF model * Shear flow * Elongational flow * Strain hardening * Low-density polyethylene * Polymer melts
Kód oboru RIV: BK - Mechanika tekutin
Impakt faktor: 1.882, rok: 2009

Experimental data of two low-density polyethylene (LDPE) melts at 200◦C for both shear flow (transient and steady shear viscosity as well as transient and steady first normal stress coefficient) and elongational flow (transient and steady-state elongational viscosity) as published by Pivokonsky et al. (J Non- Newtonian Fluid Mech 135:58–67, 2006) were analysed using the molecular stress function model for broadly distributed, randomly branched molecular structures. For quantitative modelling of melt rheology in both types of flow and in a very wide range of deformation rates, only three nonlinear viscoelastic material parameters are needed: Whilst the rotational parameter, a2, and the structural parameter, β, are found to be equal for the two melts considered, the melts differ in the parameter f 2 max describing maximum stretch of the polymer chains.
Trvalý link: http://hdl.handle.net/11104/0175036