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The Effects of Surface-Treatment for Nickel Particle in Nickel/Polycarbonate Composites
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Nikkeshi, Susumu / Ito, Eiji / Kudo, Masuo / Masuko, Toru
The effects of surface treatment of metal nickel (Ni) particles by different agents have been investigated in composites with polycarbonate resin (PC). The composites were prepared by mixing the surface-treated Ni particle with PC using a plastometer at 280Ž. For the composites containing non-treated Ni particles, the number-average molecular weight (Mn) of PC in the composites, measured by gel permeation chromatography, decreased from 24,300 to 10,800 at a mixing time of 60 min. The magnitude of the storage modulus (E') and the glass transition temperature (Tg) of the composites evaluated by dynamic viscoelastometry decreased with decreasing molecular weight of PC. These results suggest that the PC molecule is depolymerized during the mixing process due to the catalyst-like action of the Ni particles. On the other hand, we found that the surface treatment of Ni particles with tannic acid or silane coupling agents, prevented the decrease in the values of E', Tg and Mn of the composites. This implies that the surface treatment may be an effective method for composites containing a filler with catalyst-like action on the polymer.
Key words: Composite materials / Ni particle / Polycarbonate resin / Dynamic mechanical properties / Surface treatment