Study on effect of carbon black on behavior of conductive polymer composites with positive temperature coefficient

Author

Luo, Shijian ; Wong, C.P.

Author_Institution

Sch. of Mater. Sci. & Eng., Georgia Inst. of Technol., Atlanta, GA, USA

Volume

23

Issue

1

fYear

2000

fDate

3/1/2000 12:00:00 AM

Firstpage

151

Lastpage

156

Abstract

Conductive polymer composites showing large positive temperature coefficient (PTC) are made of semi-crystalline polymer as an insulator and a conducting filler, whose concentration is close to the critical volume fraction. In this study, the resistivity and PTC behavior of high density polyethylene (HDPE) filled with different carbon blacks were studied. Among those composites, N660 carbon black filled PE showed the greatest PTC behavior. Carbon black with large particle size, small surface area and small amount of aggregated structure leads to large amplitude of PTC transition (defined as the ratio of maximum resistivity to the resistivity at 25°C). The great PTC behavior is due to some microscopic mechanism under the macroscopic thermal expansion of polymer matrix during melting of polymer crystal

Keywords

conducting polymers; electromagnetic shielding; filled polymers; particle size; thermal expansion; 25 degC; EM shielding; N660 carbon black; aggregated structure; conductive polymer composites; critical volume fraction; high density polyethylene; macroscopic thermal expansion; melting; microscopic mechanism; particle size; positive temperature coefficient; semi-crystalline polymer; surface area; Conductivity; Cooling; Crystallization; Heating; Plastic insulation; Polyethylene; Polymers; Powders; Temperature; Thermal expansion;

fLanguage

English

Journal_Title

Components and Packaging Technologies, IEEE Transactions on

Publisher

ieee

ISSN

1521-3331

Type

jour

DOI

10.1109/6144.833054

Filename

833054