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Influence of Accelerator/Sulfur Ratio on Mechanical Properties and Thermal Resistance of Natural Rubber Containing Hybrid Fillers
Abstract:
This research investigated the effect of accelerator/sulfur (ACC/S) ratio on mechanical properties and thermal resistance of natural rubber composites containing hybrid fillers. Two hybrid systems of 10/60 carbon black/calcium carbonate (CB/CC) and silica/calcium carbonate (SC/CC) in NR composites were focused and the different ACC/S ratios were 0.40, 0.56, 0.64 and 0.88. The results indicated that the crosslink density, hardness and tear strength of NR vulcanizates increased with increasing ACC/S ratio, whereas compression set decreased. However, tensile strength increased with increasing ACC/S ratio up to 0.64 and then it decreased when the ACC/S ratio is further increased. In addition, the vulcanizates with high ACC/S ratio, which mainly contained monosulfidic and disulfidic linkages, exhibited a greater thermal ageing resistance than that with low ACC/S ratio which contained polysulfidic linkage. Comparing in two hybrid filler systems, the reinforcement performance of CB/CC hybrid-filled is significantly higher for all ACC/S ratios investigated.
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300-304
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July 2017
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© 2017 Trans Tech Publications Ltd. All Rights Reserved
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