Thermal properties of natural rubber versus temperature and pressure
- 1 July 1979
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 50 (7) , 4720-4724
- https://doi.org/10.1063/1.326529
Abstract
The thermal conductivity λ and the heat capacity per unit volume ρcp were determined by the transient hot-wire method at pressures up to 1.0 GPa and in the temperature range 130–340 K. Specimens were cold-pressed pure rubber and hot-pressed rubber containing 3.7% sulphur. The vulcanized variety was found to have a higher glass transition temperature Tg at all pressures. Our value of Tg at atmospheric pressure is higher by 23 K than the previously reported values from quasistatic experiments, which can be accounted for by the relaxation time of the excitation mode. The derivative of the transition temperature ∂Tg/∂P was found to decrease with increasing pressure for both samples, as predicted by a recent theory. The thermal-expansion coefficient was determined under pressure from the temperature response to adiabatic pressurization using the heat-capacity data.This publication has 13 references indexed in Scilit:
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