Showing papers by "Ming Qiu Zhang published in 1998"

Carbon‐black‐filled polyolefine as a positive temperature coefficient material: Effect of composition, processing, and filler treatment

Abstract: Polymer-based positive temperature coefficient (PTC) composites are of special interest because they have great potential in temperature-sensitive devices. To obtain a reproducible PTC composite with acceptable PTC intensity, effect of conductive filler content, processing conditions and filler treatment with nitric acid, and titanate coupling agents on room temperature resistivity and PTC intensity of carbon-black-filled low-density polyethylene composites have been described and discussed herein. The results showed that filler arrangement is a key factor influencing the ultimate material performance, which can be tailored in various ways. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 559–566, 1998

Interfacial phenomena in polymer based PTC material

Abstract: Polymer based PTC (positive temperature coefficient) composites are of special interest since they have great potential in temperature sensitive devices. In order to obtain a reproducible PTC composite with acceptable PTC intensity, the effects of processing conditions and filler treatment with nitric acid and titanate coupling agents on room temperature resistivity, PTC intensity, and melt viscosity of carbon black filled low density polyethylene composites have been described and discussed in the present paper. The results show that interfacial effect is a key factor influencing the processability and ultimate material performance, which can be tailored in various ways.