Linear PE materials – predictive/fitting capabilities of the molecular-based constitutive equations

0097710 - ÚH 2008 RIV US eng C - Conference Paper (international conference)
Pivokonský, Radek - Zatloukal, M. - Filip, Petr
Linear PE materials – predictive/fitting capabilities of the molecular-based constitutive equations.
[Lineární PE materiály - možnosti predikce a popisu pomocí konstitučních rovnic odvozených na molekulárním základě.]
PPS-23: program and proceedings. Akron: The Polymer Processing Society, 2007, P19.
[PPS-23: The Polymer Society Annual Meeting /23./. Salvator (BR), 27.05.2007-31.05.2007]
R&D Projects: GA AV ČR IAA200600703; GA ČR GA103/05/2311
Institutional research plan: CEZ:AV0Z20600510
Keywords : constitutive equations * polymer melts * shear flow * elongational flow
Subject RIV: BK - Fluid Dynamics

Two linear materials (LLDPE Exact, HDPE Tipelin) were chosen for the investigation of the predictive/fitting capabilities of the constitutive equations based on molecular theories. For the characterization the following constitutive equations were used: Extended Pom-Pom model, PTT-XPP model, and modified Leonov model. The rheological properties of the materials were studied in shear and elongation situations (steady and transient). Both materials were measured with the use of the rotational (ARES 2000) and capillary (Rosand RH7) rheometers. For the elongational measurements the SER universal testing Platform (SER-HV-A01 model) was used. First and second normal stress differences were measured with the help of the Han's method (slit die was appended to the capillary rheometer). The (dis)advantages of the individual models are compared and discussed.

Byly vybrány dva lineární materiály (LLDPE Exact, HDPE Tipelin) za účelem ověření predikčních a popisných možností vybraných konstitučních rovnic - XPP, PTT-XPP a modifikovaného Leonovova modelu, a to jak ve smykovém, tak v elongačním toku. První a druhý rozdíl normálových napětí byl měřen s využitím Hanovy metody.
Permanent Link: http://hdl.handle.net/11104/0156792