High solids content emulsions. I. A study of the influence of the particle size distribution and polymer concentration on viscosity

Abstract

An experimental and modeling study was carried out to understand the relationship between the viscosity of a multimodal latex and its particle-size distribution (PSD) and polymer concentration. This study illustrates the inadequacy of existing models in predicting the viscosity of complex latices. It is shown that the latex viscosity at a fixed shear rate is very sensitive to the polymer concentration at high solids content and to the PSD.

Modelling the zero shear viscosity of bimodal high solid content latex: Calculation of the maximum packing fraction

“…Chu et al, 1998;Chu and Guyot, 2001;D'Haene and Mewis, 1994;Farris, 1968;Greenwood et al, 1997Greenwood et al, , 1998Hoffman, 1992;Hunt and Zukoski, 1999;Kim and Luckham, 1993;Richtering and Berend, 1995;Rodriguez et al, 1992;Schneider et al, 2002;Storms et al, 1990;Moudgil, 1998, 1999). Interested readers are referred to these references for an indepth discussion of the experimental interpretation of the relationship between viscosity and PSD.…”

“…This was first demonstrated by Hunt and Zukoski (1996) in their studies on the microstructures of charge-stabilised colloidal particles. Later, Schneider et al (2002) used Monte-Carlo simulations and viscosity measurements to demonstrate this for well-defined bimodal systems.…”

“…In addition, it appears that to date, none of these studies have been able to provide a means of predicting optimum values of and . As pointed out by Schneider et al (2002) and Do Amaral (2003) one of the keys is to be able to calculate a value of m as a function of the PSD à priori. One of the objectives of the current paper is to propose a possible means of doing just that.…”

Strategies for the production of high solids acrylic/methacrylic core‐shell latices

“…This has been discussed in a number of articles, and the reader is referred to Refs. 12 and 13 for a more detailed discussion. Different attempts have been made to synthesize controlled particle size and/or high solid core shell particles.…”

“…Schneider et al 13 showed that the formation of fine particles in a bimodal latex was Figure 1 Dependence of viscosity of a latex upon its solid content for a monomodal product of different particle sizes (with identical stabilization conditions).…”