Effects of Stearyl Alcohol on Cure Characteristics and Tensile Properties of Calcium Carbonate-Filled Natural Rubber Composites
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The effects of the stearyl alcohol (SA) loading as a new rubber additive on cure characteristics and tensile properties of calcium carbonate-filled natural rubber (NR) composites were investigated. The NR composite was filled with calcium carbonate filler with a fixed loading, 30.0 phr. The SA was a fatty alcohol based on palm kernel oil and added into the calcium carbonate-filled NR composites. The SA loadings were 1.0, 3.0, 5.0 and 7.0 phr. It was found that SA acted as a co-curing (curative) and internal plasticiser. As a co-curing agent, SA increased the torque difference and tensile strength up to 5.0 phr of loading. As an internal plasticiser, SA decreased the modulus tensile and increased elongations at break of calcium carbonate-filled NR composites. The 5.0 phr of SA was the optimum loading.