采用自制的丙烯酸丁酯接枝甲基丙烯酸甲酯核壳结构增韧剂(PBA-g-PMMA,AIM)与聚氯乙烯(PVC)树脂熔融共混,制备了AIM/PVC共混物.研究了增韧剂粒子在PVC中的分散和空洞化、AIM/PVC共混物的断裂与脆韧转变.结果表明,球形的增韧剂粒子能够在PVC树脂中均匀分散并对PVC有很好的增韧作用,在PVC树脂中加入质量分数为6.5%AIM时,冲击样条以韧性方式断裂;样条冲击断面周围应力发白区域内产生了空洞.提出AIM增韧PVC的机理是橡胶粒子的空洞化与塑料基体剪切屈服协同作用.
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