粉末SBR-g-s的制备及其对PS的增韧作用

Preparation of SBRgs Powder and Its Toughening Effect on PS

用凝聚法制备了粒径小于１ｍｍ的粉末ＳＢＲｇｓ。研究了粉末ＳＢＲｇｓ对ＰＳ的增韧效果。结果发现粉末ＳＢＲｇｓ与ＰＳ共混体的冲击强度与ＳＢＲｇｓ的交联程度、接枝率和组成比有关。当ＳＢＲｇｓ的溶胀指数为２４３，接枝率为２８１％，ＳＢＲ／ｇｓ的比率为６５／３５（质量）时对ＰＳ有良好的增韧效果。当这种粉末ＳＢＲｇｓ与ＰＳ的共混比为３５／６５（质量），其共混体的冲击强度可达４８５ｋＪ／ｍ２（无缺口）。

お? The SBRgs powder whose particle size was less than 1 mm in diameter was prepared by means of coagulation. It was found that the swelling index(i.e.degree of crosslinking),the grafting ratio and the gs content (relevant to the graft chains and the homopolystyrele) of the SBRgs blending were the major factors affecting the unnotched impact strength of the final products. The toughening effects of SBRgs powder on PS were investigated. The optimal toughening effect was obtained when the swelling index in toluene, the grafting ratio and ratio of SBRgs were by weight 243,281%and 65/35 respectively.The Charpy impact strength (unnotched) at such a blending was found to be 485 kJ/m2.