Thermal-oxidative aging behavior of nitrile-butadiene rubber/functional LDHs composites

NBR-based layered double hydroxide (LDH) composites were prepared using a sodium p-styrenesulfonate hydrate (SSS) modified LDH (LDH-SSS) filler through ion exchange. The modified filler, LDH-SSS, was investigated by XRD, FTIR and TGA-DTGA, showing its layered structure was successfully obtained, as compared with the unmodified LDH-NO3. Mechanical tests of the NBR composites showed that their thermal-oxidative aging was improved, specifically by LDH-SSS. ATR-FTIR was used to study for the aging mechanism of composites. The morphology of the composites revealed by SEM and XRD shows a stronger interaction between NBR and the LDH particles with the presence of SSS. The chemical structure and the thermal properties of the composites revealed by various techniques showed an exfoliation phenomenon of the LDH-SSS, and NBR can be branched with LDH-SSS in the aging process of the composites.