An investigation on the impact fracture characteristics of EPR toughened polypropylene
An investigation on the impact fracture characteristics of EPR toughened polypropylene
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DOI：
10.1016/0142-9418(95)00041-0
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发表时间：
1996
期刊：
影响因子：
5.1
通讯作者：
W. Tam;T. Cheung;R. Li
中科院分区：
文献类型：
--
作者：
W. Tam;T. Cheung;R. Li
在本工作中，将介绍在聚丙烯（PP）中加入乙烯-丙烯共聚物（EPR）的效果，特别强调冲击断裂特性。所使用的冲击断裂表征技术包括缺口Izod冲击强度、落锤镖冲击和冲击断裂韧性Gc。研究发现，不同的技术需要选择不同的冲击速度，以确保明确的失效情况，并根据冲击过程中测量的力-时间曲线获得明确的冲击断裂历史。当存在钝的或尖锐的缺口时，分散在PP基体内部的EPR颗粒可以作为增韧添加剂发挥有效的作用。线性弹性断裂力学（LEFM）方法不仅适用于在高加载速率下以脆性方式失效的PP均聚物，而且也适用于EPR改性PP，只是需要进行塑性区修正。
The effect of adding ethylene-propylene copolymer (EPR) into polypropylene (PP), with particular emphasis on the impact fracture characteristics, will be presented in this work. The impact fracture characterization techniques used include the notched Izod impact strength, drop-weight dart impact, and the impact fracture toughness Gc. It was observed that different impact velocity needs to be selected for the different techniques in order to ensure a well defined failure situation and to obtain a well defined impact fracture history based on the force-time curves measured during impact. Whenever there was a blunt or sharp notch present, EPR particles dispersed inside the PP matrix can play an effective role as a toughening additive. Linear elastic fracture mechanics (LEFM) approach for the measurement of the impact fracture toughness Gccan be applied not only to the PP homopolymer, which failed in a brittle manner under a high rate of loading, but was also found to be applicable to EPR modified PP, except that plastic zone correction was required.