Study on application behavior of pyrolysis char from waste tires in silicone rubber composites

摘要

This work deals, in the first part, with the preparation and characterization of a type of pyrolysis char (PC) from waste tires. Best conditions were chosen to obtain the optimal PC with the largest Brunauer-Emmett-Teller (BET) surface area. The structure of PC was characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The second part focuses on preparation of novel room-temperature vulcanizated silicone rubber (SR)/PC composites. Properties such as thermal stability, flame-retardance, tensile strength, and elongation at break were researched and compared. Flame-retardance test showed that the vertical burning time and limiting oxygen index (LOI) values of different SR composites were increased. The last part evaluates the reinforcing and flame-retardant mechanisms of PC in SR composites. Polar light microscopy (PLM) and SEM analysis demonstrated that the mixture of PC and ammonium polyphosphate (APP) had better compatibility in SR matrix.