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The Proceptor analyzer was designed for measuring additives and fillers in polymer melts during processing.
It can also be used for a variety of other flowing liquids. Concentrations of ingredients in mixtures are
determined based on differences in the electrical properties of the ingredients. In two component mixtures,
composition can be determined with an uncertainty that increases with the difference in permittivities of the
components. For example, the concentration of a polar additive like water, with a large dielectric constant
around 80, is easily measured in a non-polar material like oil with a dielectric constant of two or three.
Similarly, air with a low dielectric constant of one can be measured in oil because there is a significant,
although smaller, contrast in permittivity. Most polymers are relatively non-polar and they therefore have
low permittivities, between 2 and 4. Fillers and additives are more polar and have higher permittivities.
The higher the concentration of additive, the greater the permittivity of the mixture.
Published mixing rules facilitate the quantitative determination of chemical concentrations and the estimation
of resolution in prospective applications.
Examples: materials quantitatively measured with Proceptor in-line dielectric analyzers:
- additives
- fillers
- comonomer ratios
- solvents
- chlorination
- air
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