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Fabrication of super-toughened polypropylene-based nanocomposite with low elastomer content through tailoring the microscale damage mechanisms

机译:通过剪裁微观损伤机制,用低弹性体含量制备基于超强的聚丙烯基纳米复合材料

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摘要

Structural composites with high fracture toughness have wide applications in various fields. However, achieving high toughening efficiency at low fabricating cost is still challenging. Here, one-dimensional carbon nanofibers (CNFs) were incorporated into the ethylene-octene copolymer (POE)-toughened polypropylene (PP) blends. The fracture behaviors of the samples were systematically researched under different load conditions, such as impact load condition, three-point bending test and single-edge notched tensile (SENT) measurement, and then the toughening mechanisms were proposed. The results indicated that CNFs dramatically enhanced the fracture toughness of the PP/POE blends due to that CNFs prevented the initiation and propagation of crazes. Furthermore, through incorporating an additional annealing treatment, the fracture mechanism of composites changed from crazing fracture to shear yielding-crazing fracture, which endowed CNFs with more apparent toughening effect. For example, at POE and CNF contents of 25 wt% and 1 wt%, the annealed composite sample showed the impact strength of 69.4 kJ/m(2) and elongation at break of 395.3%, which were increased by 208.4% and 92.0% compared with the unannealed binary blend, respectively. This work gives a novel insight to understand the toughening effect of one-dimensional nanofillers in the plastics/elastomer blends, and the methods may be used to toughen the other blend composites.
机译:具有高断裂韧性的结构复合材料在各种领域具有广泛的应用。然而,在低制造成本下实现了高的增韧效率仍然具有挑战性。这里,将一维碳纳米纤维(CNFS)掺入乙烯 - 辛烯共聚物(POE) - 4-1区的聚丙烯(PP)共混物中。在不同的负载条件下系统地研究样品的断裂行为,例如冲击载荷条件,三点弯曲试验和单边缘切口拉伸(送)测量,然后提出了增韧机制。结果表明,由于CNFS阻止裂化的启动和繁殖,CNF可显着增强PP / POE共混物的断裂韧性。此外,通过掺入额外的退火处理,复合材料的裂缝机制从裂缝裂缝变为剪切产生裂缝裂缝,其具有更明显的增韧效果的CNF。例如,在PoE和CNF含量为25wt%和1wt%时,退火的复合样品显示出69.4kJ / m(2)的冲击强度和突破的伸长率为395.3%,增加了208.4%和92.0%与未经发酵二进制混合物相比。这项工作介绍了了解一维纳米填充物在塑料/弹性体共混物中的增韧效果的洞察力,并且该方法可用于强化其它混合物复合材料。

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  • 来源
    《Composites Science and Technology》 |2020年第16期|108148.1-108148.9|共9页
  • 作者单位

    Southwest Jiaotong Univ Sch Mat Sci & Engn Key Lab Adv Technol Mat Minist Educ Chengdu 610031 Peoples R China;

    Southwest Jiaotong Univ Analyt & Testing Ctr Chengdu 610031 Peoples R China;

    Southwest Jiaotong Univ Sch Mat Sci & Engn Key Lab Adv Technol Mat Minist Educ Chengdu 610031 Peoples R China;

    Southwest Jiaotong Univ Sch Mat Sci & Engn Key Lab Adv Technol Mat Minist Educ Chengdu 610031 Peoples R China;

    Southwest Jiaotong Univ Sch Mat Sci & Engn Key Lab Adv Technol Mat Minist Educ Chengdu 610031 Peoples R China;

    Southwest Jiaotong Univ Sch Mat Sci & Engn Key Lab Adv Technol Mat Minist Educ Chengdu 610031 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    polymer-matrix composites (PMCs); Fracture toughness; Fiber bridging;

    机译:聚合物 - 基质复合材料(PMC);断裂韧性;纤维桥接;

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