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Fullerene containing polyurethane nanocomposites for microwave applications
Author(s) -
Chopra Swati,
Alam Sarfaraz
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.38343
Subject(s) - materials science , nanocomposite , thermogravimetric analysis , thermal stability , polyurethane , barium titanate , composite material , reflection loss , permittivity , prepolymer , ultimate tensile strength , composite number , chemical engineering , ceramic , dielectric , optoelectronics , engineering
Novel flexible polyurethane (PU) composite films containing nano‐barium hexaferrite (BaF) and nano‐barium titanate (BT) have been synthesized and characterized. The PU nanocomposites were synthesized from fullerenol and prepolymer of hexamethylene diisocyante and polytetramethylene glycol by adding 1–3% each of BaF (high permeability) and BT (high permittivity). The incorporation of the nanopowders was confirmed by X‐ray diffraction (XRD), transmission electron microscopy, and energy dispersive X‐ray diffraction (EDX). Study of thermal properties by thermogravimetric analysis and dynamic mechanical analysis revealed enhanced thermal stability of the nanocomposites. Study of mechanical properties showed that the tensile strength had increased remarkably in the nanocomposites. The electromagnetic‐absorbing properties were studied by measuring the complex permeability and permittivity in the frequency range of 8.2 to 12.4 GHz. The good reflection loss of the nanocomposites at such low filler content suggests its potential applicability as a radar absorber. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013