文献类型：期刊文献

中文题名：剪切变形对PPR断裂韧性的影响

英文题名：Effect of shear deformation on the fracture toughness of random co-polypropylene

作者：王婷兰[1];唐颂超[1];郭娟[1];陈建定[1]

机构：[1]华东理工大学材料科学与工程学院,上海市先进聚合物材料重点实验室,超细材料制备与应用教育部重点实验室,上海200237

年份：2010

卷号：27

期号：3

起止页码：15

中文期刊名：合成树脂及塑料

外文期刊名：China Synthetic Resin and Plastics

收录：CSTPCD;;Scopus;北大核心:【北大核心2008】；

基金：上海市重点学科和重点实验室项目资助(B502);上海市重点学科建设项目资助(08DZ2230500)

语种：中文

中文关键词：无规共聚聚丙烯;剪切变形;等通道转角挤压;断裂韧性

外文关键词：random co-polypropylene; shear deformation; equal channel angular extrusion; fracture toughness

摘要：采用等通道转角挤压(ECAE)方法,研究了剪切变形对无规共聚聚丙烯(PPR)结构和断裂韧性的影响。实验发现,在挤压温度为45℃时,进行ECAE加工有利于PPR球晶的取向形变和非晶区取向。断裂韧性实验表明:经过ECAE挤压后试样的裂纹扩展方向与球晶的取向方向一致;经45℃挤压后,试样产生单位新断裂表面所需的能量是未挤压试样的3.7倍,且该能量的98%是通过塑性变形来吸收的;断面形态表明由剪切变形产生的层状结构是其断裂扩展所需能量增加的原因。
An equal channel angular extrusion（ECAE） was used to study the influence of shear deformation of random co-polypropylene （PPR） on its structure and fracture toughness. The experiments find out that the spherulites and amorphous phase of the PPR are prone to orientation more favorably at extrusion temperature of 45 ℃ than at 105 ℃. The crack propagation direction of the shear deformed specimen accords with orientation direction of the spherulites. The energy needed in unit area of newly fractured surface of the specimens deformed at 45 ~C reaches 45.39 kJ/m2, 3.7 times of that of un-deformed reference specimens. Furthermore, 98% of the fracture energy is absorbed by plastic deformation. The sandwich structure induced by shear deformation explains the major reason for the increment in energy needed in crack propagation as inferred from the morphology of the fracture surfaces.