通过乳液接枝聚合技术合成不同聚丁二烯(PB)含量的聚丁二烯接枝聚苯乙烯(PB-g-PS)共聚物,共混改性聚苯乙烯(PS),使PB含量控制在20 wt%.通过对接枝共聚物PB-g-PS接枝度的测定,分析了不同接枝度对橡胶粒子分散状态以及橡胶粒子内部结构的影响,考察了不同接枝度对改性聚苯乙烯力学性能的影响.通常认为橡胶粒子只有在1～3 μm时才能对聚苯乙烯进行有效增韧,然而实验结果表明,使用粒径约为300 nm的核壳橡胶粒子改性聚苯乙烯冲击韧性提高很大.此时,接枝共聚物具有最佳核壳比PB/PS为70/30,橡胶粒子呈均匀分散状态,且最大冲击强度为124.9 J/m,相当于纯聚苯乙烯冲击强度的10倍.
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