Measurement and modeling of uniaxial and planar extensional viscosities for linear isotactic polypropylenes

• Published in: Physics of fluids (1994) Vol. 35; no. 1
• Main Authors: Drabek, Jiri, Zatloukal, Martin
• Format: Journal Article
• Language: English
• Published: Melville American Institute of Physics 01.01.2023
• Subjects: Constitutive equations; Constitutive relationships; Friction reduction; High strain rate; Isotacticity; Mathematical models; Modelling; Newton Theory; Newtonian fluids; Orifices; Polypropylene

In this work, novel rectangular and circular orifice (zero-length) dies were used to measure planar and uniaxial extensional viscosities as a function of strain rate for various linear isotactic polypropylene melts by using Cogswell methodology. The obtained experimental data were combined with shea...