Effect of surface treatment on rheological behaviors of glass bead/hydroxyl terminated polybutadiene suspensions

Surface treatment of glass bead (GB) was carried out by using γ-glycidoxypropyltrimethoxy silane (GPTES) and γ-methacryloxypropyltrimethoxy silane (MPTMS) as coupling agents, respectively. The steady viscosity and yield stress of the GB/hydroxyl terminated polybutadiene (HTPB) suspensions were determined by Brookfield R/S rheometer. The effect of surface treatment on the viscosity and yield stress of GB/HTPB suspension was investigated. The results indicate that the viscosity of the pristine GB/HTPB suspension increases with increasing GB, and the relationship between its viscosity and volume fraction of GB depends on the shear rate. The modification of GB by MPTMS changes the viscosity of the MPTMS@GB/HTPB suspension, and its viscosity is the minimum at the MPTMS dosage of 0.3 g per 1 g GB. Additionally, the modification of GB by MPTMS increases the yield stress of the GB/HTPB suspension, and its yield stress is the maximum at the MPTMS dosage of 0.1 g per 1 g GB. The GPTES modified GB/HTPB suspension behaves lower viscosity and weaker shear thinning than the MPTMS modified GB/HTPB suspension within the range of experimental shear rate.