Abnormal Behaviors in the Capillary Rheometry of Plastisol Formulations
| Autor: | Yamina Abdesselam, Yves Demay, Jean-François Agassant, Romain Castellani |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Polymers and Plastics Rheometry Capillary action General Chemical Engineering Rheometer 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering Rheology Coating Plastisol 0103 physical sciences Materials Chemistry engineering Composite material 010306 general physics 0210 nano-technology |
| Zdroj: | International Polymer Processing. 33:363-370 |
| ISSN: | 2195-8602 0930-777X |
| DOI: | 10.3139/217.3554 |
| Popis: | The rheology of plastisol formulations for flooring applications using knife-over-roll coating process is studied using both Couette and capillary rheometers. The behavior is similar in many aspects to the rheology of suspensions: Shear thinning behavior at low shear rate, then a Newtonian plateau at intermediate shear rates followed by a dilatancy peak. However several abnormal phenomena may be observed in capillary experiments. At very high shear rates, a second shear thinning behavior is observed which depends on the flow geometry. Due to the non-monotonous behavior of the plastisol viscosity, this is analysed using a dedicated numerical method. An apparent slip velocity has been determined. Otherwise capillary experiments point out the existence of important entrance pressure loss. These measures are interpreted using a modified Cogswell method as an important elongationnal viscosity, around hundred times the shear viscosity. |
| Databáze: | OpenAIRE |
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