Toughening Polypropylene and Its Nanocomposites with Submicrometer Voids
Toughening Polypropylene and Its Nanocomposites with Submicrometer Voids
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DOI：
10.1021/ma100633y
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发表时间：
2010-06
期刊：
影响因子：
5.5
通讯作者：
A. Dasari;Qingxin Zhang;Z. Yu;Y. Mai
中科院分区：
文献类型：
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作者：
A. Dasari;Qingxin Zhang;Z. Yu;Y. Mai
本文研究了聚丙烯（PP）和PP/CaCO3纳米复合材料在加工过程中诱导分布均匀的亚微米空隙的新概念，以在不牺牲杨氏模量和屈服强度的情况下减轻其脆性。在拉伸和双缺口四点弯曲（DN-4-PB）试验中，研究了这些孔洞在启动/参与塑性变形过程中的作用。结果表明，在橡胶增韧聚合物体系中，这些空洞的作用方式与空化橡胶颗粒相似；也就是说，变形时PP基体（预先存在的空隙）发生塑性增长，随后引发周围基体以孤立的、域状裂纹结构的形式发生大的塑性变形。
This paper deals with a novel concept of induction of well-distributed submicrometer voids in polypropylene (PP) and PP/CaCO3 nanocomposites during processing to alleviate their brittleness without sacrificing Young’s modulus and yield strength. The role of these voids in initiating/participating in the plastic deformation processes during tensile and double-notch four-point-bend (DN-4-PB) tests is investigated. It is shown that the voids act in a similar way as the cavitated rubber particles in rubber-toughened polymer systems; that is, plastic growth (of the pre-existent voids) in the PP matrix occurs upon deformation and subsequently triggers large plastic deformation of the surrounding matrix in the form of isolated and domainlike craze structures.