Physical properties of syndiotactic polystyrene (sPS)/poly(2,6-dimethyl-1,4-phenylene oxide (PPO) alloys and their feasible estimation for reflective cups of light emitting diodes (LEDs)

► The effects of antioxidants and processing parameters on the thermal stability and processability of sPS have been investigated. ► With appropriate antioxidants, color contamination and thermal stability of sPS have been improved. ► sPS/PPO alloys are potential materials for reflective cups of LEDs with proper recipes of TiO 2, antioxidants, impact modifiers, and flame retardants. In this paper, the effects of antioxidants and processing parameters on the thermal stability and processability of sPS have been investigated. Experimental results indicate that a long processing duration and mechanic shearing force accelerate the thermal oxidation and addition of antioxidants into sPS can effectively improve color contamination and thermal stability. Furthermore, feasible estimation of sPS/PPO alloys for reflective cups of light emitting diodes (LEDs) have also been made, demonstrating that sPS/PPO alloys are potential candidates by the appropriate prescription of impact modifiers, flame retardants, and titanium dioxide.