Abstract:In this study, the flocculation behavior and demulsification kinetics of ESBR/SiO2 emulsion were investigated by the addition of NaCl and CaCl2 solution and effects of TESPT and NXT silane coupling agents on the mechanical properties, dynamic viscoelastic properties and rheological properties of the composites were probed. It is found that a constant and then accelerated process is displayed in the system of NaCl solution while another retarded process is shown in the system of CaCl2 solution, and the demulsification effects of silica in different systems is significantly different. This can be ascribed to the different ability between Ca2+ and Na+ for demulsification, leading to different behaviors in the nucleation center of silica. In addition, it is found that the tensile strength and elongation at break of the NXT modified silica filled composites are significantly enhanced, and the rolling resistance is significantly reduced while the wet skid resistance is maintained.