Abstract
Copper powder dispersed poly-methyl methacrylic acid (acrylic resin, PMMA) composites (PMMA-Cu) were prepared by the solution cast method. The Cu addition at the critical volume fraction (15:0 � 1:0 vol%Cu) drastically enhanced the electric conductivity from the insulator (10 � 14 Sm � 1 ) to the electric conductor (10 5 Sm � 1 ). The electric conductivity can be obtained by controlling the volume fraction of copper powders in PMMA polymers, as dilatation. The addition of 10 vol%Cu slightly enhanced the impact value of PMMA, whereas the remarkable decrease in the Charpy impact value was found at 25 � 5 vol%Cu. The high conductive PMMA-Cu composites (from 15 to 20 vol%Cu) with high impact value (5:5 � 0:5 kJm � 2 ), which was higher than that of dispersed nylon6 composites (2 kJm � 2 ) utilized for practical exteriors, were obtained without impact value decay by addition of small amount of copper powders. [doi:10.2320/matertrans.M2010120]
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