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Physical Properties of Ferrite Nanocomposites

M.H. Chang, D.W. Chae, Y.H. Cho, K.H. Lee and B.C. Kim
Hanyang University, KR

nylon-66, nanocomposites, ferrite, dynamic viscosity, tensile proeperties

Ferrite nanoparticles were incorporated into the nylon-66 by melt-compounding and their effect on the physical properties were investigated. The nanoparticles were well dispersed in nylon-66 without large agglomerate. The presence of ferrite nanoparticles less than 1 wt% increased the crystallization temperature (Tc) by 4.2 ?, but further addition decreased Tc with the loading level. At 0.1 wt% loading of ferrite, nanoparticles the onset temperature of degradation increased by 7.3 ? while further addition decreased the thermal stability of nylon-66 matrix. The incorporation of ferrite nanoparticle produced the rheological properties of heterogeneous system. Nylon-66 nanocomposites with ferrite more than 5 wt% showed higher shear thinning behavior and even lower dynamic viscosity (?') than pure polymer. The WAXD profiles of the nanocomposite presented neither new peak nor the peak shift compared with those of pure nylon-66. The nylon-66 and its nanocomposites except ny66-20 presented likely-plateau region in the stress-strain curve. Except very low loading level (0.1 wt%), the presence of ferrite nanoparticles decreased the ductility of the polymer. Their tensile strength increased up to the 1 wt% ferrite loading but after the value, it decreased with increasing the loading level. The modulus increased with the loading level.

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