Volume 137, Issue 12 48482
Article

Improvement of polyimide/polysulfone composites filled with conductive carbon black as positive temperature coefficient materials

Sunan Tiptipakorn

Sunan Tiptipakorn

Department of Chemistry, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaengsaen Campus, Nakhon Pathom, 73140 Thailand

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Noppawat Kuengputpong

Noppawat Kuengputpong

Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330 Thailand

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Manunya Okhawilai

Manunya Okhawilai

Metallurgy and Materials Science Research Institute, Chulalongkorn University, Bangkok, 10330 Thailand

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Sarawut Rimdusit

Corresponding Author

Sarawut Rimdusit

Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330 Thailand

Correspondence to: S. Rimdusit (E-mail: [email protected])Search for more papers by this author
First published: 12 September 2019
Citations: 15

ABSTRACT

In this study, polyimide (PI)/polysulfone (PSF) blends filled with carbon black (CB) were developed for the use as positive temperature coefficient (PTC) materials in order to achieve the volume resistivity as lower than 104 Ω.cm at room temperature. The weight ratios of PI/PSF were various from 100/0 to 10/90 with CB varied from 0 to 20 wt%. The use of conductive filler was reduced when PSF was blended with PI; the blends clearly possessed a percolation threshold decreased by 90%. The electrical conductivity of the CB-filled blends was higher than those of CB-filled pure PI. The transition temperature for PTC material was reported in the range of 180 to 210 °C. The preferential location of CB filler in PI domains could be observed using the optical microscope. In addition, the composites met the standards for the obtained mechanical and thermal properties, exhibiting the potential use as PTC materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48482.

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