Nadia A. Ali, Farah T. Mohammed Noori* and Sinaa I.Hussin
Abstract
Frequency and temperature dependence of dielectric constant ( ) and dielectric loss ( ) in
pure epoxy resin and polymer composites with glass fiber are studied in the frequency range
40Hz-110 MHz and in the temperature range (25-150)0C.The experimental results show that and
increased with the addition of glass fiber in epoxy resin. The value of ( ) decreased with increasing
frequency which indicates that the major contribution to the polarization comes from orientation
polarization .Dielectric loss peaks were also observed in the composite materials at high
temperature due to Tg of epoxy .The value of ( ) increased with increasing temperature, and is due
to greater freedom of movement of the dipole molecular chains within the epoxy at high
temperature
سيناء ابراهيم حسين | Seenaa Ibraheim Hussein | 4750