A. Kaynak et al., A STUDY OF MICROWAVE TRANSMISSION, REFLECTION, ABSORPTION, AND SHIELDING EFFECTIVENESS OF CONDUCTING POLYPYRROLE FILMS, Journal of applied polymer science, 54(3), 1994, pp. 269-278
Microwave transmission, reflection, and absorption behavior and the sh
ielding effectiveness of electrochemically synthesized polypyrrole fil
ms with dc conductivities ranging from 0.001 to 50 S/cm are presented.
Results show that the electrical conductivity of the doped polypyrrol
e films has a significant effect on transmission, reflection, and abso
rption of microwaves. Heavily doped, conducting films were highly refl
ective, whereas lightly doped, semiconducting films had very high tran
smission. Intermediate conductivity polypyrrole samples were highly ab
sorptive. The agreement between experimental data and theoretical mode
ling provided confidence to extend the modeling to include the effect
of sample thickness on the transmission, reflection, and absorption pr
operties of films with a wide range of conductivity values, hence, pro
viding valuable information for the design of microwave devices and fu
ndamental understanding of the material properties. A method of measur
ing the far-field shielding effectiveness of polypyrrole films is also
presented. Results of shielding experiments indicated the potential f
or such applications. (C) 1994 John Wiley & Sons, Inc.