Abstract
This study deals with the effect of coupled thermal and cyclic mechanical loadings on the viscoelastic response of carbon black filled nitrile rubber. For this purpose, cyclic loading tests were performed at different temperatures by means of Dynamic Mechanical and Thermal Analysis (DMTA). The type and level of the thermomechanical loadings applied were chosen in order to determine the relative contribution of each of the mechanical and thermal loadings (and their coupling) to the viscoelastic response during the cyclic tests. X-ray Photoelectron Spectroscopy (XPS) and Fourier Transformed Infrared spectroscopy (FTIR) analyses were also carried out to track the change in the chemical structure corresponding to the evolution in the viscoelastic response. First, results obtained show that due to the crosslink increase, the storage modulus increases with the number of cycles. It is also observed that temperature amplifies this phenomenon. Second, the cyclic mechanical loading is found to significantly amplify the effect of temperature.
Highlights
Most of the studies dealing with damage in rubbers under mechanical cyclic loading conditions focus on damage, which corresponds to crack initiation and growth until final failure
Three series of cyclic tests have been performed on filled nitrile rubber in order to discriminate the effect of the mechanical loading on the change in the microstructure of filled nitrile rubber under high temperature, typically from 140 to 180 degree Celsius
This change in the microstructure induces an increase in the storage modulus and a decrease in the loss factor, which is correlated with a hardness increase
Summary
Most of the studies dealing with damage in rubbers under mechanical cyclic loading conditions focus on damage, which corresponds to crack initiation and growth until final failure (see for instance [1]). For the nitrile rubbers studied in the present paper, preliminary tests under such loading conditions have shown that damage does not correspond to crack initiation and growth but to a significant change in the microstructure. These changes induce both a variation of the initial viscoelastic properties and a hardness increase. By focusing on possible applications, the rubber part loses its damping properties
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