(1. Lanzhou Research Institute of Industry, Lanzhou 730050, China) (2. College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China)
Polybutylene terephthalate (PBT) materials are widely used in the engineering field due to its high temperature resistance, but it is necessary to add flame retardants to reduce the flammability of PBT materials. However, flame retardants have a negative effect on the mechanical properties of PBT materials. In this study, nano-Sb2O3 particles were prepared by mechanochemical method, then modified by KH550. Nano-Sb2O3/BPS/PBT composites were prepared by melt blending method. The mechanical properties of nano-Sb2O3/BPS/PBT composites were studied by tensile test and impact test. The fracture morphologies of nano-Sb2O3/BPS/PBT composites were characterized by SEM. The results show that with the increase of nano-Sb2O3 content, the tensile strength and impact strength of composites increase firstly and then decrease. When the nano-Sb2O3 content is 1.5wt%, both tensile strength and impact strength of composites achieve the best values. When the nano-Sb2O3 content is more than 1.5wt%, the mechanical properties of composites decrease significantly due to the soft agglomeration of nano-Sb2O3 particles. Moreover，SEM image shows a lot of crazes form on the fracture surface of nano-Sb2O3/BPS/PBT composites, and there still exists obvious yield phenomenon.