Regensburg 2007 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 9: POSTER: Colloids and Nanoparticles

CPP 9.23: Poster

Montag, 26. März 2007, 16:00–18:00, Poster B

Contribution of Carbon Black Features to Tunnel Current — •Tobias Sonnleitner and Dietmar Göritz — Institut für Physik, Universität Regensburg, 93040 Regensburg

To get information concerning conductor insulator compounds such as rubber, one possibility is the dielectric spectroscopy. By measuring the dielectric constant of a compound as a function of the frequency of the applied electrical field one gets various information about the sample. On the one hand dielectric experiments deliver information on the conductance of the sample, and on the other hand information on the static limit of the dielectric function. The static limit of the dielectric function in case of higher filling degrees is linked to the amount of polymer chains between the filler particles. And again, the contribution of tunnel currents to the conductance of the sample is linked to the amount of rubber in between the filler particles. We investigated different carbon blacks (N326, N330, N339, N356) in a SBR 1500 matrix. The results of the experiments show that the amount of rubber in between the filler particles and the influence of tunnel currents are linked to a well known carbon black characteristic, the specific surface of the carbon black: greater specific surfaces lead to greater amounts of rubber in between the filler particles and hence a lower contribution of tunnel currents to the conductance of the sample.