Abstract
The silica (SiO2) dispersion and interfacial adhesions are two essential factors for preparing rubber/SiO2 composites with excellent mechanical properties. However, the dispersion of SiO2 in natural rubber is very poor. In this study, cardanol grafted liquid isoprene rubber (CA-g-LIR) with groud-like structure was applied to adjust the interfacial adhesion between SiO2 and natural rubber (NR). The properties of the obtained rubber composites were also investigated. The results of scanning electron microscope (SEM), Mooney Viscometer (MV) and rubber process analyzer (RPA) demonstrated that CA-g-LIR improved the dispersion of SiO2 in NR, reduced the Mooney viscosity of NR, prolonged the scorching time of NR and decreased the Payne effect of SiO2 in NR. Furthermore, the tensile strength of NR100/CA-g-LIR15/SiO2 composites are higher 26.67%, 13.25% and 18.42% than NR100/LIR15/SiO2 composites when the added SiO2 is 30, 40, 50 phr respectively. In short, CA-g-LIR was found to be a plasticizer and compatibilizer as well as an anti-coke agent. The potential application of CA-g-LIR could provide a simple and convenient green strategy for industry to solve the problem of poor dispersion of polar SiO2 in non-polar rubber.
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