In this study, styrene butadiene rubber (SBR)/organoclay nanocomposites were manufactured using the latex method with 3-aminopropyltriethoxysilane (APTES) and N,N-dimethyldodecylamine (DDA) as modifiers. The layer-to-layer distance of the silicates was observed according to each manufacturing process for APTES as the modifier using the X-ray diffraction (XRD) method. From the XRD results and the TEM images, the dispersion of the silicates impoved for both APTES-MMT and DDA-MMT, and the dispersion of the silicates with the DDA modifier improved more than the APTES modifier. The SBR/DDA-MMT compound exhibited the fastest scorch time, optimal vulcanization time, and cure rate. The dynamic viscoelastic properties of the SBR/APTES-MMT compound were measured according to the change in the strain amplitude in order determine if a covalent bond was formed between APTES and bis(triethoxysilyl-propyl)tetrasulfide (TESPT). The mechanical properties of the SBR/DDA-MMT nanocomposite improved more than the SBR/APTES-MMT composite because the vulcanization effects of alkylamine and the dispersion of silicates within the rubber matrix were relatively good.

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In this research, the adhesion between ethylene methyl acrylic (AEM) rubber and polyester fabric treated with isocyanate and the fatigue properties of the AEM rubber-polyester fabric composites were examined. Experiments were conducted according to the concentrations of isocyanate adhesive solution in order to determine the optimum concentration of the adhesive agent and the results showed that adhesion was the most superior when 14% solution was applied and this was also confirmed by Scanning electron microscope morphology. Moreover, the impregnated polyester fabric was treated at 120, 170, 200, and 230°C and peel test was conducted in order to determine the optimum curing condition. The results showed that adhesion was the most superior when the polyester fabric was cured for 2 min at 230°C. It was judged that this resulted from the network structure of isocyanate and the formation of carbodiimide structure at the curing temperature of 230°C. Comparing to the fatigue properties of the rubber-fabric composites from single dip system and the double dip system, the crack number and the accumulated crack length, the crack propagation was lower when the double dip system was applied. This resulted from the flexibility of the interphase of the polyester fabric-AEM rubber composites by the application of resorcinol-formaldehyde-latex (RFL).