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OALib Journal期刊
ISSN: 2333-9721
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橡胶粒子和刚性纳米粒子对注塑级硬质聚氯乙烯复合材料断裂行为的影响
DOI: 10.3724/SP.J.1105.2011.10375, PP. 1395-1401
Keywords: 聚氯乙烯,纳米复合材料,断裂,有限元分析
Abstract:
采用核壳型丙烯腈-苯乙烯-丁二烯共聚物(ABS)和纳米碳酸钙(CaCO3)协同改性聚氯乙烯(PVC),制备了注塑级硬质PVC纳米复合材料.通过透射电镜(TEM)、扫描电镜(SEM)、力学性能测试研究了其结构与性能,并采用有限元模拟方法研究了ABS与纳米CaCO3粒子对复合材料断裂行为的影响.当CaCO3含量低于12phr时,ABS和纳米CaCO3粒子在PVC基体中分散均匀,可起协同增韧作用.在外力作用下,ABS粒子形变主要以内空化方式进行.CaCO3未发生团聚时,CaCO3与PVC基体界面在外力作用下形成微孔;CaCO3发生团聚时,CaCO3与PVC基体界面处形成较大的裂纹.有限元分析结果表明,未发生团聚时,CaCO3和ABS粒子均可提高PVC基体的局部内应力,促使材料发生局部塑性屈服,导致复合材料屈服强度降低、冲击强度提高.
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