Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Real-Time Monitoring of Polymer Nanocomposites Composition during Extrusion Compounding



Rick D. Davis, Jeffrey W. Gilman, Anthony J. Bur, M M. McBrearty, P R. Start, Young J. Lee


Dielectirc spectroscopy was conducted during extrusion processing of polyamide-6 (PA6) and layered silicate/polyamide-6 manocomposites. Dielectric dispersion parameteers were identified that appear sensitive to layered silicate concentration and degree of exfoliation. Specific to measuring layered silicate concentration is that the Maxwell-Wagner strength of dispersion, delta epsilonmw, increase linearly with the % mass fraction layered silicate content. This relationship is independent of exfoliation resulting in nanomorphology-averaged delta epsilondmw values that reflect layered silicate concentration; i.e. 12,800 {+ or-} 519 indicates 1.29% mass fraction of a layered silicate in PA6. The nanomorphology is primarily reflected in the Maxwell-Wagner characteristic relaxation frequency value, fmw, where for example, 80.4 {+or-} 5Hz indicates a mixed intercalated/exfoliated nanomorphology. However, following the nanomorphology with the fdmw value can in some significant difference in the conductive resistance and segmental mobility of these polymers, as indicated by the sigmaDC and fda values. For f^da values that are much larger than determined for the intercalated nanocomposites.
Plasma Processes and Polymers
45 No. 19


Davis, R. , Gilman, J. , Bur, A. , McBrearty, M. , Start, P. and Lee, Y. (2004), Real-Time Monitoring of Polymer Nanocomposites Composition during Extrusion Compounding, Plasma Processes and Polymers (Accessed June 15, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created September 1, 2004, Updated February 19, 2017