Toughening and strengthening of polypropylene using the rigid-rigid polymer toughening concept Part II Toughening mechanisms investigation

被引：0
|
作者：
Guang-Xue Wei
H.-J. Sue
J. Chu
Chengya Huang
Kecheng Gong
机构：
[1] Texas A&M University,Polymer Technology Center, Department of Mechanical Engineering
[2] Texas A&M University,Polymer Technology Center, Department of Mechanical Engineering
[3] Visteon Automotive System,Department of Polymer Material Science and Technology
[4] South China University of Technology,undefined
[5] Guangzhou,undefined
来源：
Journal of Materials Science | 2000年 / 35卷
关键词：
Polymer; Particle Size; Microscopy; Electron Microscopy; Scanning Electron Microscopy;
D O I：
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中图分类号：
学科分类号：
摘要：
Toughening mechanisms in blends of isotactic polypropylene and Noryl polyphenylene oxide/polystyrene (iPP/Noryl) are studied using optical microscopy, scanning electron microscopy and transmission electron microscopy. Large Noryl particles (10–15 μm) are formed in iPP/Noryl blend and crazing is found to be the dominant toughening mechanism. A detailed investigation of fracture mechanisms reveals that Noryl particles help trigger and stabilize massive crazes in the iPP matrix. Incorporation of a small amount of styrene-ethylene-propylene (SEP) compatibilizer helps reduce Noryl particle size and improve interfacial adhesion between iPP and Noryl particles. Crazing and shear banding mechanisms are found to operate sequentially in iPP/Noryl/SEP blends. As a result, significantly improved toughness is obtained.
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页码：555 / 566
页数：11
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