采用乳液接枝聚合技术在粒径为100nm的聚丁二烯(PB)乳胶粒子上接枝聚合苯乙烯(St),制得了具有不同核壳比(PB与PS的质量比)的一系列PB-g-PS接枝共聚物.将其与聚苯乙烯(PS)树脂熔融共混,考察了核壳比对PS/PB-gPS共混物的力学性能和形态结构的影响,研究了共混物的增韧机理.结果表明,随着核壳比的增加,共混物的冲击强度呈现先增加后减小的趋势,并在核壳比为70/30时达到最大值,而橡胶粒子在基体中的聚集程度逐渐增大;均匀分散在基体中的橡胶粒子不能引发银纹,而发生聚集形成的橡胶粒子簇引发了大量的银纹成为共混物的主要形变机理.
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