EFFECT OF SURFACE MODIFICATION AND PARTICLE SIZE ONDIELECTRIC PROPERTIES OF IRON(III)OXIDE-EPOXY COMPOSITE FILM

摘要

In this work surface modified iron(III)oxide particles reinforced epoxy composite warmermaterial was fabricated. The effect of particle addition on polarization, dielectricproperties and heat dissipation was studied. To enhance ionic polarization and electronmobility on epoxy thermoset fine iron(III)oxide filler was selected and utilized as apositive ions. Particle size of 800 and 200nm was used as filler and effectiveness ofparticle size on dielectric behavior was studied. Uniform distribution of fillers on matrixfavors desirable outputs hence the particles were surface treated with an amine functionalcoupling agent (APTMS).Siliconization process was done by thermo assisted aqueoussolution method. Epoxy particulate composite was fabricated by reinforcing 0.25, 0.5, 1.0,2.0, 4.0 vol% of siliconized iron(III)oxide followed by hand layup method. Crystalline andfunctional groups of siliconized iron(III)oxide particles were characterized by XRD andFTIR spectroscopy analysis. All proportions of composites were cured by an aliphatichardener triethylenetetramine (TETA). The scanning electron microscopy images revelsthe shape and size of iron(III)oxide particles in different milling time and dispersionquality in epoxy matrix. Dielectric properties of iron(III)oxide reinforced composites wereinvestigated with parallel plate capacitor method. Dielectric loss and constant wasanalyzed as a function of frequency and temperature. Dielectric loss was increased whenparticle loading was increased. The as-received iron(III)oxide particles gives little effecton dielectric loss, whereas surface functionalized iron(III)oxide particle gives maximumbecause of good dispersion and more active site for electron mobility in epoxy matrix. Theincreased temperature affects the dielectric loss and constant because of supplied internalenergy that was studied at 100oC. Dielectric constant of epoxy was increased significantlywhen particle loading increases and reduced when temperature and frequency wasincreased.