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F. Lequeux, P. Cassagnau, R. Valette, G. Ducouret
Flow and Processing of Highly Filled Materials Workshop (2016)

Appl. Rheol. 26:1 (2016) 47-48

Cite this publication as follows:
Lequeux F, Cassagnau P, Valette R, Ducouret G: Flow and Processing of Highly Filled Materials Workshop (2016), Appl. Rheol. 26 (2016) 47.

C. Laine, P. Cassagnau
Prediction of Zero Shear Viscosity of Poly (Vinyl Chloride) Plastisols

Appl. Rheol. 16:3 (2006) 136-144

The rheological behaviour of PVC plastisols composed of a blend of suspension and micro-suspension resins in different proportions was investigated. The present work was mainly focused on the variation of the zero shear viscosity versus the concentration of the extender resin. Hence, the packing fraction Fm was evaluated using the Krieger-Dougherty equation. These experiments confirmed the major influence of particle size distribution concerning the decrease of viscosity for concentrated suspensions. In addition, a model based on the porosity model developed by Ouchiyama et al. (Ouchiyama N, Tanaka T: "Porosity estimation for random packings of spherical particle", Ind. Eng. Chem. Fundam. 23 (1984) 490-493) to predict the packing fraction in the case of multimodal lattices was successfully applied to our PVC plastisols formulations.

Cite this publication as follows:
Laine C, Cassagnau P: Prediction of Zero Shear Viscosity of Poly (Vinyl Chloride) Plastisols, Appl. Rheol. 16 (2006) 136.

C. Lacoste, L. Choplin, P. Cassagnau, A. Michel
Rheology Innovation in the Study of Mixing Conditions of Polymer Blends during Chemical Reaction

Appl. Rheol. 15:5 (2005) 314-325

Polymer melts can be mixed with many monomers, plasticizers, antistatics or foaming additives. Properties of such mixtures can change during blending because of chemical reactions like polymerization or crosslinking. The process may be carried out either in stirred tanks, extruders or in motionless mixers. In this paper we focused on the mixing time and the diffusion time of reagent, plasticizer and polymer thanks to rheological tools, and on the way how rheological properties can be studied during chemical reaction in polymer blending. The concept of rheoreactor and Couette analogy were introduced since we have a reactor on our disposal that can mix solution and measure rheological properties without taking sample. This apparatus appears to be an appreciable tool in complement of internal mixers that are specific to polymer blending. For example, we show the importance of the competition between mixing time and reaction time for reactive systems.

Cite this publication as follows:
Lacoste C, Choplin L, Cassagnau P, Michel A: Rheology Innovation in the Study of Mixing Conditions of Polymer Blends during Chemical Reaction, Appl. Rheol. 15 (2005) 314.


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