Impact Value of High Electric Conductive ABS Composites with Copper Powder Dispersion Prepared by Solution-Cast Method

Abstract

Copper powder dispersed acrylonitrile butadiene styrene (ABS) composites were prepared by the solution cast method. Although the addition of Cu greatly enhanced the electric conductivity at the critical volume fraction (19:0þ=À1:0 vol%Cu) from the insulator to the electric conductor, the decrease in the Charpy impact value was gradual. Since the impact value of the ABS polymer prepared by the solution cast method was 1.75 times larger than that before treatment, it is clear that the solution casting improved the impact value. When the volume fraction of Cu powders of high electric conductive ABS composites was from 20 to 30 vol%Cu, the impact value was 7 kJm À2 . The moderated impact value was not only 44% of that of pure ABS polymer before solution casting, but was also higher than that of dispersed nylon6 composites (2 kJm À2 ) utilizeed for practical exteriors.

High Electric Conductive PMMA Composites without Impact Value Decay by Dispersion of Copper Powder

“…2) The additions of Cu powder in ABS polymers also decrease the impact value 10) with the rapid increase in electric conductivity from the insulator to the electric conductor found at 19:0 AE 1:0 vol%Cu in ABS, 10) (see Fig. 5).…”

“…Figure 5 shows relationships between copper addition (V M ) and conductivity () of solution treated powder dispersed PMMA and ABS composites (PMMA-Cu or ABS-Cu 9,10) ). The addition of Cu up to 13 vol% slightly enhances the conductivity, although the electric conductivity remains low (about 10 À14 Sm…”

“…3,10) Since the interfacial adhesive strength (attractive force) between aluminum and nylon6 is not due to chemical bonding and thus is not so large, the addition of 10 vol%Cu and Al in ABS and nylon6 converts the type of fracture from ductile matrix fracture to weakly bonded interfacial fracture between metal and polymer. 3,10) On the other hand, the addition of 10 vol%Cu slightly raises the impact value of solution casted PMMA polymer. The impact value is independent to the Cu addition, when the weak strength of polymer molecules in PMMA is approximately equal to the interfacial adhesive strength (attractive force) between copper and PMMA polymer.…”

“…5 Relation between copper additions (V M ) and conductivity () of powder dispersed PMMA composites (PMMA-Cu), 11) together with Cu powder dispersed ABS composites (ABS-Cu). 9,10) is lower than that at Cu-ABS-Cu interface, it is explained that the conductivity of PMMA-Cu with copper addition from 16 to 50 vol%Cu is lower than that of ABS-Cu from 20 to 50 vol%Cu. Based on the low conductive PMMA-Cu with copper addition below 14 vol%Cu and high electron transfer at Cu-PMMA-Cu interface of PMMA-Cu with copper addition from 16 to 50 vol%Cu, it is explained that the transition in electrical conductivity near critical volume fraction of PMMA-Cu is smaller than that of ABS-Cu.…”

“…2,3) Both appropriate impact value and appropriate electric conductivity of copper powders ABS composites (ABS-Cu) have been found. 10) However, it is a serious problem for Cu addition to decrease the impact value of the high electric conductive composites in a predictable manner. In addition, since both transparency and machinability with popularity of inexpensive poly-methyl methacrylic acid (acrylic resin, PMMA) are better than ABS polymer, the appropriate impact value of the appropriate conductive copper powder dispersed PMMA composites (PMMA-Cu) is expected.…”