Rheology of physically evolving suspensions |
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Authors: | Hassane Boudhani René Fulchiron Philippe Cassagnau |
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Institution: | (1) Université de Lyon, CNRS UMR5223, Ingénierie des Matériaux Polymères/Laboratoire des Matériaux Polymères et Biomatériaux, Université Lyon 1, Villeurbanne, F-69622 Lyon, France |
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Abstract: | The objective of this work was to investigate the modeling of the whole dynamic rheological behavior of physically evolving
suspensions (e.g., polyvinyl chloride plastisols). The evolutions of the complex viscosity with time (isothermal) and with
temperature (non-isothermal) were analyzed. To understand the physically involved phenomena, the determination of relationships
between the solid volume fraction evolution and the rheological behavior was investigated. Firstly, the evolution of the volume
fraction in relation with the variation of radii particle suspensions using a modified Avrami equation was determined. Actually,
the rheological study of this physically evolving system is far too complicated due to the many factors involved in the evolving
process. Consequently, a phenomenological law using Carreau–Yasuda equation and percolation laws combined with the evolution
of the solid volume fraction is investigated to obtain the modeling of the whole dynamic rheological behavior at any frequency
and temperature. |
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Keywords: | Evolving suspensions Rheology Sol– gel transition Percolation |
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