SEBS弹性体增韧改性PE-HD/PS共混物及其相容性研究

采用聚苯乙烯嵌段聚（乙烯亚丁基）嵌段聚苯乙烯（SEBS）弹性体增韧改性高密度聚乙烯（PE-HD）/聚苯乙烯（PS）共混物，通过哈克转矩流变仪制备了PE-HD/PS/SEBS三元共混物，采用扫描电子显微镜（SEM）、旋转流变仪、冲击试验机、热重分析仪（TG）和差式扫描量热仪（DSC）等手段研究了PE-HD/PS/SEBS共混体系的相容性。结果表明，SEBS对共混体系具有良好的增容作用，但当SEBS添加量大于8 %(质量分数，下同)后，部分SEBS出现团聚现象，导致共混体系相容性降低；SEBS的引入对共混物的耐热性影响不大，共混物中连续相PE-HD的熔点稍有降低；随着SEBS添加量的增加，共混物的悬臂梁缺口冲击强度大幅提高。

Study on Toughening and Compatibilizing Effect of SEBS Elastomer on PE-HD/PS Blends

The high-density polyethylene (PE-HD)/polystyrene (PS) blends were prepared by a HAAKE torque rheometer using poly(styrene-b-ethylene-butylene-b-styrene) (SEBS) elastomer as an impact modifier, and the compatibilizing effect of SEBS on this blending system was investigated by a scanning electron microscope, rotary rheometer, impact tester, thermogravimetric analyzer and differential scanning calorimeter. The results confirmed an effective compatibilizing effect of SEBS on the blending system. However, the aggregation was observed when the SEBS content was higher than 8 wt %, which led to a decrease in compatibility of the blending system. There is also no influence on the heat resistance of the blends from SEBS, whereas the melting point of PE-HD phase decreased slightly due to the introduction of SEBS. The notched Izod impact strength was improved significantly with an increase of SEBS content.