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An investigation on modelling and measurements of transient elongational rheology of polymer melts by ser testing platform

Rajabian, M ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. Publisher: 2009
  3. Abstract:
  4. Transient elongational rheology of PP is investigated experimentally. A specifically designed fixture consisting of two drums mounted on a TA Instruments ARES rotational rheometer was used to measure the transient uniaxial extensional viscosity of two commercial grades polypropylene in the molten state. The Hencky strain was varied from 0.003 to 2 s-1 and the temperature was fixed at 180 °C. The measurements show that the steady state elongational viscosity was reached at the measured Hencky strains for polypropylene. Eslami and Grmela have recently introduced a reptation diffusion term arising from the intermolecular chain forces into the rigid FENE-P dumbbells model. The same approach has been used in this study to interpret the transient rheological data in both shear-free and simple shear flows
  5. Keywords:
  6. Commercial grade ; Elongational viscosity ; Extensional viscosity ; FENE-P dumbbells model ; Molten state ; Reptation ; Rheological data ; Rotational rheometer ; Simple shear flow ; Steady state ; Testing platforms ; Elasticity ; Plasticity ; Polymer melts ; Rheology ; Strain ; Thermoplastics ; Viscosity
  7. Source: E-Polymers ; 2009 ; 16187229 (ISSN)
  8. URL: https://www.degruyter.com/view/journals/epoly/9/1/article-118.xml