Oscillating shear capillary rheometry (OSCAR) for polymer melts
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Dario Nichetti
Abstract
Knowing the flow parameters of a polymer melt under steady state condition is required to assess the performance of the material in die and mold design. Often, however, this is not sufficient for a full understanding of the polymer processing behavior, and information on the linear and non-linear viscoelastic behavior is needed. In this paper, the non-linear viscoelastic behavior of a polymer under shear flow has been investigated by measuring the stress response when a cyclic oscillating shear rate in a capillary rheometer is applied. The time-dependent wall shear stress has been decomposed into in-phase viscous and elastic components. A model to interpret the experimental results is presented and applied to a well-characterized polystyrene and two polyethylenes with similar rheology but different molecular structure (HDPE and LLDPE). The relevant characteristics resulting from the model, such as the generalized elastic and viscous modulus under shear, are compared and discussed.
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Articles in the same Issue
- Frontmatter
- Editorial
- Special issue: Polymer engineering rheology
- Material properties
- Volume fraction and width of ribbon-like crystallites control the rubbery modulus of segmented block copolymers
- Influence of trisilanol isooctyl POSS content on the structure, morphology and rheological properties of thermoplastic polyurethane (TPU)
- Engineering and processing
- Oscillating shear capillary rheometry (OSCAR) for polymer melts
- Plastic drawing response in the biaxially oriented polypropylene (BOPP) process: polymer structure and film casting effects
- A quantitative study on using digital photoelasticity for characterising the effect of the stretching speed on the necking phenomenon
- Effects of structure and processing on the surface roughness of extruded co-continuous poly(ethylene) oxide/ethylene-vinyl acetate blends
- Processability predictions for mechanically recycled blends of linear polymers
- Prediction of the maximum flow length of a thin injection molded part
Articles in the same Issue
- Frontmatter
- Editorial
- Special issue: Polymer engineering rheology
- Material properties
- Volume fraction and width of ribbon-like crystallites control the rubbery modulus of segmented block copolymers
- Influence of trisilanol isooctyl POSS content on the structure, morphology and rheological properties of thermoplastic polyurethane (TPU)
- Engineering and processing
- Oscillating shear capillary rheometry (OSCAR) for polymer melts
- Plastic drawing response in the biaxially oriented polypropylene (BOPP) process: polymer structure and film casting effects
- A quantitative study on using digital photoelasticity for characterising the effect of the stretching speed on the necking phenomenon
- Effects of structure and processing on the surface roughness of extruded co-continuous poly(ethylene) oxide/ethylene-vinyl acetate blends
- Processability predictions for mechanically recycled blends of linear polymers
- Prediction of the maximum flow length of a thin injection molded part
