Electrical, dielectric, and dynamic mechanical properties of conductive carbon black/epoxidized natural rubber composites. (July 2016)

• Record Type: Journal Article
• Authors: Matchawet, Suradet; Kaesaman, Azizon; Bomlai, Pornsuda; Nakason, Charoen
• Is Part Of: Journal of composite materials. Volume 50:Number 16(2016)
• Page Start: 2191
• Page End: 2202
• Publication Date: 2016-07
• Subjects: Conductive rubber composites -- epoxidized natural rubber -- electrical properties -- dielectric constant -- dynamic mechanical properties -- conductive filler; Composite materials -- Periodicals; Composites -- Périodiques; 620.118
• DOI: 10.1177/0021998315602941
• Languages: English
• ISSNs: 0021-9983

Abstract

Electrically conductive epoxidized natural rubber filled with conductive carbon black was prepared. The AC conductivity ( σAC ), dielectric constant ( ɛ′ ), loss factor (tan δ*) and dynamic mechanical properties of the composites were studied. It was found that the epoxide groups in epoxidized natural rubber molecules positively contributed to AC conductivity, dielectric constant, and tan δ* of the composites. Especially, the composite with epoxidized natural rubber containing 50% mol epoxide (epoxidized natural rubber–50) showed better electrical and dynamic mechanical properties than the composites with epoxidized natural rubber–25 or NR. The effects of conductive carbon black loading level on electrical conductivity and dielectric constant of the epoxidized natural rubber–50/conductive carbon black composites was also studied. The percolation threshold was found at very low content of conductive carbon black at volume fraction of 0.07 with the critical exponent value 2.04. Furthermore, the glass transition temperatures of epoxidized natural rubber–50/conductive carbon black composites were higher than those of epoxidized natural rubber–25/conductive carbon black or NR/conductive carbon black composites, and increased with conductive carbon black content.