IN SITU SILICA REINFORCED RUBBER LATEX COMPOSITE: EFFECTS OF BLEND RATIO AND SILICA CONTENT
Keywords:
Natural rubber latex, Carboxylated styrene-butadiene rubber latex, Rubber blend, Silica, Rubber compositeAbstract
The effects of blend ratio and silica content were studied on mechanical, morphological, and thermal properties of rubber blends and composites. Natural rubber (NR) was blended with carboxylated styrene-butadiene rubber (XSBR) at different ratios of NR/XSBR, i.e., 1:1, 1:2, and 2:1. The optimum mechanical properties of NR/XSBR blends was obtained from NR/XSBR at the optimum ratio of 2:1. NR/XBSR with the optimum ratio was mixed with silica in silicate form. Commercial sodium silicate (CSS) was used to prepare the silica for use as reinforcing filler. NR/XSBR was firstly mixed with CSS to obtain the mixture of NR/XSBR/CSS. And then, acetic acid was dropped into the mixture to obtain the precipitated silica at various contents of silica (5, 10, and 20 phr). The addition of silica into NR/XSBR at the ratio of 2:1 can improve the thermal property of the NR/XSBR blends. By increasing silica contents, an insignificant difference in terms of tensile strength and elongation at break of the mechanical properties was observed. The best thermal properties were obtained from NR/XSBR/20Si composite.
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