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Polymer00069 - (even lower than that of the pure elastomer...

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58 2.5 Conclusions In this chapter FKM nanocomposites comprising five types of nanofillers were successfully prepared. The effects of these nanofillers on the vulcanization behavior and curing kinetics of the elastomer were investigated. T-SiO 2 , due to the amino groups on its surface, was able to take part in the crosslinking reaction of the elastomer and increase its crosslink density. As a result, it resulted in the highest mixing torque during the initial cure stage and the lowest activation energy during the post cure stage. T-SiO 2 ’s role as a secondary crosslinking agent offered its FKM nanocomposites the lowest damping and the highest mechanical properties, glass transition temperature, and thermal stability. T-G was found to hinder elastomer curing because it led to the lowest mixing torque
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Unformatted text preview: (even lower than that of the pure elastomer) and the highest activation energy (higher than that of the pure elastomer). Further investigation is required to find the reason. FS-clay and S-clay caused remarkable decrease in the thermal stability of the elastomer. This was due to the ammonium salt surfactant attached to the clays, which decomposed at elevated temperature and the decomposition products catalyzed thermal decomposition of the elastomer. All the tested nanofillers were found to increase the mechanical properties, glass transition temperature, and storage modulus of the elastomer. The degree of improvement depended on their interactions with the elastomer matrix and their effects on elastomer vulcanization....
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