Determination of particle size and relative concentration of pure acrylic emulsion with PCCS
Pure acrylic emulsion belongs to the group of polymer emulsions. It is related to acrylic paints which form a water-resistant film after drying. In general, the acrylic emulsion is used as an additive for paints and varnishes in order to improve abrasion resistance, washability and resistance to fungi and algae.
The particle size, distribution and concentration are important quality features for optimal functionality and workability of the emulsion. Film formation and pigment-binding capability are enhanced by fine particles. Furthermore, acrylic emulsions with fine particles have a larger surface area and therefore have greater interaction with thickeners. The particle size also affects the emulsion viscosity: large particles usually connote a low viscosity, while small particles result in a high viscosity.
The pure acrylic emulsion is frequently in a cloudy, highly-concentrated form and should also be measured in this original state. A possible dilution of the emulsion can lead to changes in droplet size, particle formation and stability. The photon cross-correlation spectroscopy (PCCS) implemented in NANOPHOX eliminates possible multiple scattering and can therefore be used to measure high concentrations. The measurable particle concentrations are much higher than with the conventional dynamic light scattering (DLS) using photon cross-correlation spectroscopy (PCS).
- Quick and stable measurement method
- Product analysis in the undiluted original state where possible
- Particle size distribution influences quality of the acrylic emulsion
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Measurement results PCCS vs. PCS
Innovative PCCS correctly measures the emulsion droplet size regardless of the concentration | Cloudy sample at original concentration (red curve) | Diluted sample 1:1,000 (blue curve)
Conventional PCS correctly measures the emulsion droplet size only when strongly diluted | Cloudy sample at original concentration (red curve) | Diluted sample 1:1,000 (blue curve)
