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Rubber nanocomposites based on natural rubber (NR)-butadiene nitrile rubber (NBR) blend filled with silane modified nanosilica (NSBT) and carbon black (CB) were prepared by melt mixing method by using an internal mixer. The effect of CB and NSBT on thermo-mechanical properties of the materials was investigated by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), dynamic-mechanical analysis (DMA) and tensile testing method. The results show that the NR/NBR blends reinforced with both CB and NSBT possess the properties much better than that reinforced with only CB or NSBT. With the CB/NSBT ratio of 25/5, the properties of the NR/NBR blends were remarkably enhanced, especially the increase in tensile strength by about 64 % and the increase in the thermal stability by about 13 o C. The reasons for the improvement of NR/NBR blends' properties are due to better compatibility of the components in the rubber blend as well as the better compactness in their structure with the presence of NSBT.

In this work, nitrile butadiene rubber (NBR)/chloroprene rubber (CR) blends were prepared and investigated. The results showed that NBR and CR in the NBR/CR (50/50) blend were partially compatible. This blend had a relatively regular and compact structure, which improved the mechanical properties as well as the weather resistance, thermal stability, and oil, grease resistances. At the DLH compatibilizer content of 1% (made from Cashew nut shell liquid) or D01 (made from Tung oil), the materials possess better mechanical and physical properties due to much more regular and compact structure. NBR/CR blends can be potential materials for industrial applications which demand high oil and grease resistance and good weather resistance as well as good thermal stability.

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