Dielectric response and relaxation phenomena in Ag /epoxy resin nanocomposites

L.A. RAMAJO; M.S. CASTRO; M.M. REBOREDO

Florianópolis, Brasil

Congreso; III Encontro da SBPMat; 2006

The influence of silver nanoparticles on dielectric behaviour of epoxy matrix was studied. Silver was produced through AgNO3 chemical reduction in ethanol and triethylenetetramine at 25ºC. Afterwards, alcohol was evaporate in vacuum at 40ºC for 4 hours and the result (amine and Ag), were used as epoxy curing agent. Dielectric measurements showed that dielectric constant of composites depended on the filler amount, the temperature and the frequency. Dielectric losses also were influenced by the temperature and by the frequency through relaxation process, even though volume fractions did not have influence on losses.