Summary: The flex‐fatigue life of carbon‐black‐filled SBR was dramatically improved by incorporation of 4–5 phr nanodispersed clay. Addition of clay did not decrease the degree of crosslinking of the composite but improved the hysteresis and tearing energy. ESEM observation of the flexing‐fracture morphology indicated that nanodispersed clay layers had the advantage over carbon black in that they could blunt the crack.
Effect of the clay amount on the flex fatigue life of the composites. 相似文献
The influence of fillers like clay, silica, and carbon black on the rheological properties of 1,2 polybutadiene has been studied using a capillary rheometer. Silica filled compound exhibited the highest viscosity and clay filled compound the lowest viscosity at all shear rates. The effect of filler loading and temperature on the Theological behavior has also been studied. Smooth extrudates were obtained in most of the cases and die swell was lower for silica and carbon black filled compounds than for clay filled compounds. Rheograms of different 1,2 polybutadiene systems have been found to merge into a master curve using modified viscosity and shear rate functions that contain melt flow index as a parameter. 相似文献
Curing of carboxylated nitrile rubber (XNBR) with epoxy resin in presence of different fillers has been studied. It was observed that 7.5 phr of resin give a compromise combination of properties in FEF black (N 550)-filled vulcanizates at 40 phr loading. Further studies at different loadings of black, reinforcing silica and clay were done at 7.5 phr resin. Technical properties at different filler loadings have been determined. Polymer-filler interaction involving FEF black, silica, and clay was examined by a Kraus plot and the equation of Lorenz and Parks. Silica and carbon black give a similar type of reinforcement, but clay shows nonreinforcing characteristics. In the case of carbon black–XNBR system, polymer-filler attachment is similar to that existing in carbon black–natural rubber system. In the case of silica, reaction of the silanol group with the epoxide group of the epoxy resin and the carboxyl group of the base polymer may be responsible for the polymer-filler attachment. Scanning electron microscopy (SEM) studies of the fracture surfaces corroborate the findings on technical properties and polymer-filler interaction. 相似文献