In-Line Dielectric Sensor for Chemical Composition Measurements in Molten Polymers

Published

January 1, 1999

Author(s)

M M. McBrearty, Anthony J. Bur, S Perusich

Abstract

We describe a dielectric sensor that incorporates a flow-through design so that it can be placed in-line on an extruder. Dielectric measurements have been successfully applied for measuring additive concentrations in polymer melts during extrusion processing. Calcium carbonate and alumina filled polystyrene are used to demonstrate sensor capability. Theory and experiment indicate that dielectric measurements of filled polymer melts can quantitatively determine individual or total additive concentrations with an accuracy that depends on the electrical contrast and can exceed 0.1 volume percent with polymers and compounds having one or possibly two dominant additives.

Proceedings Title

Proceedings of the Society of Plastics Engineers Annual Technical Meeting

Volume

20

Conference Dates

May 1, 1999

Conference Location

New York, NY

Conference Title

Society of Plastics Engineers

Pub Type

Conferences

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Keywords

dielectric properties, filled polymers, in-line measurements, material composition, polymer processing

Citation

McBrearty, M. , Bur, A. and Perusich, S. (1999), In-Line Dielectric Sensor for Chemical Composition Measurements in Molten Polymers, Proceedings of the Society of Plastics Engineers Annual Technical Meeting, New York, NY, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851531 (Accessed October 18, 2025)