Miniemulsification in high‐pressure homogenizers

Abstract

in Wiley InterScience (www.interscience.wiley.com).The mechanisms involved in the formation of high solids content composite polymer-monomer waterborne miniemulsions in a high-pressure homogenizer were investigated combining experimental results and a mathematical model for the process. It was found that the final droplet size was the result of two consecutive processes: droplet break-up and coagulation. The final droplet size was determined by the mechanism giving the largest droplet size

Viscosity effects in miniemulsification via ultrasound

“…A primary mixture was produced using a certain concentration of SDS in water as the aqueous phase followed by addition of the oil. The overall volume of the emulsion was 40 cm 3 . The mixture was placed in a 50 cm 3 beaker, and the sonication horn was immersed in the solution.…”

“…The overall volume of the emulsion was 40 cm 3 . The mixture was placed in a 50 cm 3 beaker, and the sonication horn was immersed in the solution. A small emulsification vessel was chosen to avoid long circulation times and produce homogeneous mixing in the vessel.…”

“…3 The mechanisms by which nanoscale drops are formed via these energy-intensive emulsification methods are of significant interest to academics, as well as industrialists working on the emulsification technologies.…”

Poly(3-hydroxybutyrate-co-3- hydroxyvalerate) nanoparticles prepared by a miniemulsion/solvent evaporation technique: effect of phbv molar mass and concentration

“…Musyanovych et al (2008) evaluated the effect of the ratio between the organic and aqueous phases (O/W ratio) on the average size of polymerchloroform miniemulsion droplets and solid polymeric nanoparticles, as well as the effect of molar mass of the polymers (PLLA and PCL). Manea et al (2007) investigated the effect of the viscosity on the droplet size caused by the alkyd resin content in the organic phase of a miniemulsion prepared with a high pressure homogenizer system. They concluded that an increase in the viscosity influenced the droplet break up mechanism, leading Brazilian Journal of Chemical Engineering Vol.…”

Feasibility of Tubular Microreactors for Emulsion Polymerization

“…In the fifth strategy, a double sonication approach was implemented, in which the pre-emulsion (run S1) was sonified first in a Branson batch sonifier and was then passed continuously through the UMC at 100% amplitude (run S5). The aim of this last strategy was to reduce the entering droplet sizes even more, as observed by Manea et al, [31] and also to keep the feed much more uniform along the time. Figure 5 shows the evolution of the conversion and particle size of the reactions carried out under above described strategies in a 6 m length tube and at 15 min of residence time.…”