Abstract
The effect of sulfur accelerators during the curing process in natural rubber (NR) was investigated. The samples were prepared by adding the same fraction of various types of accelerators in the compound and all samples were cured at the same temperature but for two different times. Determination of the molecular massbeween crosslinks immediately after vulcanization shows the crosslink density in the samples, which differs for different accelerators. After that, the same samples undergo thermal aging and the changes of the crosslink dinsity were studied. During the first period of thermal aging, additional crosslink were observed and then a period of deterioration of the network structure is following. From the obtained relults of the molecular mass between crosscan be drawn about the most suitable accelerator for use in certain conditions and applications. To predict the behavior of vulcanizates under various effects as heat and radiation, it is important to know more about the chemical structure of the network. The changes of crosslink density in the investigated samples were followed by eqiomobrium swelling and by mechanical measurements. IR spectroscopy was used to study the changes of the crosslink bridges. The influence of aging time on the maximum tensile strength, for NR vulcanizates cured 5 min.
Published Version
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