Nanostructured Fly Ash-Styrene Butadiene Rubber Hybrid Nanocomposites

摘要

Hybrid nanocomposites of styrene butadiene rubber (SBR) with nanostructured fly-ash (NFA) were prepared in the laboratory by melt blending technique in an internal mixer. Curatives were added on a laboratory two-roll mill. Curing characteristics as well as physico-mechanical properties of the composites were evaluated. A comparison on SBR composites filled with fresh fly-ash (FFA); carbon black (CB) and precipitated silica (PS) has been reported. In general, SBR-NFA composites exhibit higher state of cure and higher strength properties as compared with HAF black-filled and fresh fly-ash-filled SBR composites at equivalent loadings. This may be attributed to the higher reinforcing ability of NFA. This fact has also been supported by the swelling studies and Kraus' plot. Tear strength and abrasion resistance of the SBR-NFA composites were superior to FFA-filled and precipitated silica-filled vul-canizates, but were inferior to carbon black- filled SBR vulcanizates. The SBR-NFA composites showed lower hardness as compared with both the carbon black-filled and silica-filled composites. Transmission electron microscopy and scanning probe microscopy studies revealed that the NFA particles are well dispersed in the SBR matrix. These results were further supported by fracture surface analysis under the SEM, which revealed the role of NFA in the prevention of fracture propagation.