Electromagnetic absorption efficiency of polypropylene/montmorillonite/polypyrrole nanocomposites

• Published in: Materials in engineering Vol. 32; no. 4; pp. 2006 - 2011
• Main Authors: MouAeka, Robert, MravAeakova, Miroslava, VilAeakova, Jarmila, Omastova, Maria, Saha, Petr
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2011
• Subjects: A. Polymer matrix composites; Conducting polymers; Dielectric loss; E. Electrical; F. Microstructure; Montmorillonite; Particulate composites; Polymer matrix composites; Polypropylenes; Polypyrroles; Shielding; E. Electrical; A. Polymer matrix composites; F. Microstructure
• ISSN: 0261-3069
• DOI: 10.1016/j.matdes.2010.11.064

► Binary polypropylene/polypyrrole and ternary composites containing clay were studied. ► An electromagnetic shielding efficiency was compared for these two kinds of composites. ► Shielding efficiency of ternary composite was two times higher compared to binary one. ► Polypyrrole layer on the surface of clay considerably increased dielectric losses. Electrical conductivity and dielectric properties have been studied for two types of polypropylene composites containing conducting phase. One type comprised conducting polymer–polypyrrole while the second employed montmorillonite particles coated with conducting polymer–polypyrrole. Composites’ shielding properties were estimated based on their previously determined electromagnetic characteristics. Unlike a basic binary polypropylene/polypyrrole composite, the ternary sample with multicomponent montmorillonite particles exhibits higher dielectric losses and consequently a significant rise in shielding efficiency in the radio-frequency range of 0.1–1.5GHz. This stems from the presence of highly polarizable multicomponent montmorillonite anisotropic lamellar particles with polypyrrole conducting layer, which considerably increases the complex permittivity of the composite.