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首页> 外文期刊>Journal of Applied Polymer Science >Toughening Mechanisms in Commercial Thermoplastic Polyolefin Blends
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Toughening Mechanisms in Commercial Thermoplastic Polyolefin Blends

机译：商业热塑性聚烯烃共混物的增韧机理

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摘要

Impact fracture mechanisms in a variety of commercially available and experimental thermoplastic polyolefin (TPO) blends were studied using the double-notch four-point-bend Charpy impact test, followed by microscopy observations. It was shown that the failure mechanisms and the sizes of the subcritically formed crack-tip damage zone before fracture were quite different among the TPO systems investigated. The room temperature Izod impact strengths of the TPOs investigated were found to correlate qualitatively well with the sizes of the damage zone. At room temperature the main fracture mechanisms observed in TPOs include amtrix crazing, particle-matrix debonding, rubber particle internal cavitation, and shear banding. At low temperature (-40deg C), the operative fracture mechanisms in TPOs are limited only to crazing, particle cavitation, and debonding. A strategy for improving impact strength without sacrificing scratch/mar resistance of TPOs is discussed.
机译：使用双缺口四点弯曲夏比冲击试验，然后通过显微镜观察，研究了各种市售和实验热塑性聚烯烃（TPO）共混物中的冲击断裂机理。结果表明，在所研究的TPO系统中，断裂之前的亚临界裂纹尖端破坏区的破坏机理和大小差异很大。发现所研究的TPO的室温艾佐德冲击强度与损伤区域的大小在质量上具有良好的相关性。在室温下，在TPO中观察到的主要断裂机理包括：胶束开裂，颗粒-基质剥离，橡胶颗粒内部空化和剪切带。在低温（-40摄氏度）下，TPO中的有效断裂机制仅限于开裂，颗粒空化和脱胶。讨论了一种在不牺牲TPO耐刮擦/耐擦伤性的情况下提高冲击强度的策略。

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