Negative Temperature Coefficient of PVC Filled with Carbon Black
PVC filled with carbon black (CB) composition were prepared by a conventional melt-mixing method. The effects of CB on the negative-temperature-coefficient (NTC) effect and the resistivity-temperature characteristic of PVC/CB composites were studied. Our present research suggests that percolation threshold can be obtained for the content of CB 10%. The reasons of NTC phenomenon were also investigated from point of view of polymer structure. We also discussed relationship between the current and voltage, that is, the I-U characteristic of the composites can be divided into two regions, ohmic and nonohmic according to the different content of CB and voltage.
Riza Esa and Yanwen Wu
J. X. Li "Negative Temperature Coefficient of PVC Filled with Carbon Black", Advanced Materials Research, Vols. 301-303, pp. 1128-1132, 2011