Low-frequency dielectric relaxation in rubber.
A rubber sample is investigated by dielectric spectroscopy in the frequency range from 10(-2)<or=nu<or=10(7) Hz. Measurements are performed under both isothermal (at ambient pressure) and isobaric conditions. The spectral shape of the loss peaks is symmetric and temperature and pressure independent. Hence the temperature-pressure-frequency superposition principle is fulfilled in a cross-linked rubber sample. The Vogel-Fulcher-Tammann temperature law and its pressure counterpart well describe the respective temperature and pressure dependences of relaxation times. In addition we determined the activation volume from isothermal relaxation data.
Janik
P
P
Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland.
Paluch
M
M
Ziolo
J
J
Sulkowski
W
W
Nikiel
L
L