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Experimental Study of Loss Mechanisms in Polymer-Metal Composites at Microwave Frequencies

Published online by Cambridge University Press:  15 February 2011

John P. Ludman  and
Curtis H. Stern
John P. Ludman
Affiliation:
Virginia Polytechnic Institute and State University, Department of Mechanical Engineering, Blacksburg, VA 24061–0238
Curtis H. Stern
Affiliation:
Virginia Polytechnic Institute and State University, Department of Mechanical Engineering, Blacksburg, VA 24061–0238
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Abstract

The microwave heatability of a low loss polymer (polypropylene) was enhanced by the addition of a conductive powder (iron). The effects of the amount (5–40% iron by volume) and size of the conductive particles on the microwave heatability were studied. The complex permittivity and complex permeability at microwave frequencies and the dc resistivity were measured. Samples were also heated in a multimode microwave cavity. Results show that microwave heating increased with increasing iron concentration. However, the penetration depth of the microwaves decreased with increasing iron content, and dramatically decreased when the polypropylene-iron composites became electrically conductive at the percolation threshold.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 347: Symposium O – Microwave Processing of Materials IV , 1994 , 717
Copyright
Copyright © Materials Research Society 1994

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References

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