Abstract:
Silicone rubbercompositesfilledwithmicro-andnano-aluminawerepreparedandtheeffectoffillercontentsonthemicrowave
dielectric, mechanical,thermalandmoistureabsorptionpropertieswereinvestigated.Thecompositewith0.45volumefraction(Vf) of
micro aluminahasarelativepermittivity(er ) of5.89anddielectricloss(tan d) of9 10–3 whereas 0.05volumefractionofnano-alumina
has er of 3.52andtan d of 1.97 10–2, respectivelyat5GHz.Theexperimental er and tan d values ofsiliconerubber-micro-alumina
composites werecomparedwiththatoftheoreticalmodels.AmongthetheoreticalmodelsModifiedLichteneckerandParallelmodelare
in goodagreementwithexperimentalvaluesof er and tan d respectively. Thesiliconerubbernano-aluminacompositeshavebetter
mechanical properties.Thecoefficientofthermalexpansion(CTE)ofcompositesdecreasedandthemoistureabsorptionincreasedwith
increasing amountoffillerloading.Theimprovedpropertiesindicatethatthesiliconerubber-micro-aluminacompositeisagood
candidate foraflexiblemicrowavesubstrateapplication.
& 2013 ElsevierLtdandTechnaGroupS.r.l.Allrightsreserved.
