双峰橡胶粒子体系改性聚苯乙烯

Dual rubber particle system toughened polystyrene

制备了具有双峰粒径分散的橡胶粒子协同增韧聚苯乙烯树脂,得到了具有超高韧性的高抗冲聚苯乙烯。首先通过乳液接枝聚合的方法合成抗冲击改性剂聚丁二烯接枝聚苯乙烯核壳结构粒子,通过共混改性的方法将通用级聚苯乙烯、商业级高抗冲聚苯乙烯和核壳抗冲击改性剂共混得到超高韧性聚苯乙烯树脂。通过断裂表面透射电子显微镜照片发现,材料中Salami结构橡胶粒子能够引发银纹,银纹通过小粒径橡胶粒子阻止了裂纹的产生,吸收了大量的能量,使材料本身的韧性得到提高。

Toughened polystyrene with dual rubber particle is made to get the high deformation polystyrene. The core-shell polybutadiene-grafted-polystyrene （PB-g-PS） is prepared with emulsion polymerization by grafting styrene onto polybutadiene latex. Then the core-shell impact modifiers were blended with polystyrene and high-impact polystyrene to prepare PB-g-PS/PS/HIPS blends. The experimental results show that the strength of the toughened polystyrene is improved significantly. The transmission electron microscopy images of fracture surfaces indicate that the deformation mechanism is multi-crazing to prevent the cracks, so the flexibility of the materials is improved.