Thermomechanical, Tensile and Morphological Properties of Allylic Monomer as Reactive Plasticizer and Reinforcement in Polystyrene/Polyphenylene Oxide Blends

摘要

The use of diallyl phthalate (DAOP) monomer as both reactive plasticizer and reinforcement in polystyrene/polyphenylene oxide (PS/PPO) blends was investigated. The blends of a fixed amount of PS (80%) with different contents of PPO-DAOP were prepared using an internal mixer and glass transition temperature (T_g), tensile and morphological properties of the blends were studied. T_g of the blends gradually reduced with the replacement of PPO with up to 4%DAOP might be due to the reduction of rigid component (PPO) but then plateau in the presence of 6%DAOP may be due to presence of higher content of cured DAOP. Tensile test conducted on the blends indicated that tensile strength and modulus increased with increasing DAOP content up to 4wt% and then slight reduced with further increased of DAOP with the value slightly higher than PS/PPO blend without DAOP suggesting that DAOP could act as reinforcement in PS/PPO blend. Morphological study of the blends showed single phase of 80PS/20PPO blend while blends with DAOP illustrated rough, two phase morphologies with DAOP particle size increased with increasing DAOP. However, in the presence of 6% DAOP, smoother surface was observed which translated into reduction of tensile strength and modulus of the blends.