We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Carbon black/high density polyethylene conducting composite materials: Part II The relationship between the positive temperature coefficient and the volume resistivity.
- Authors
MATHER, P. J.; THOMAS, K. M.
- Abstract
Carbon black/polymer composites can be used in a variety of industrial applications, where a high conductivity is an important physical parameter. The relationship between the positive temperature coefficient (PTC) effect and the room temperature volume resistivity has been investigated. These are two of the more important operating parameters. Resistivity-temperature measurements were performed on a radiation crosslinked high structure (H) carbon black mixed at different concentrations in HDPE. The results obtained for composites with a range of carbon black properties showed that there was a linear relationship between log (R2/R1) and log R1, where R2=maximum resistivity and R1=room temperature volume resistivity. The relationship can be taken as a reference line for the assessment of the relative effect that modifying the carbon black structure and changing the mixing variables on the relative magnitude of the PTC effect and the room temperature volume resistivity. The high structure (H) carbon black structural characteristics were modified by both gas phase (carbon dioxide at 900°C) and liquid phase (nitric acid) treatments. The former treatment procedure resulted in a decrease, while the latter an increase in the volume resistivities of the final composites. These results are discussed in terms of the effect of surface functionality and carbon structural characteristics.
- Subjects
HIGH density polyethylene; CARBON; POLYMERS; COMPOSITE materials; CROSSLINKING (Polymerization); TEMPERATURE measurements; CARBON dioxide
- Publication
Journal of Materials Science, 1997, Vol 32, Issue 7, p1711
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1023/A:1018567731526