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首页> 外文期刊>Composites Science and Technology >Reinforcement efficiency of carbon nanotubes and their effect on crystal-crystal slip in poly(ether ketone)/carbon nanotube composite fibers
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Reinforcement efficiency of carbon nanotubes and their effect on crystal-crystal slip in poly(ether ketone)/carbon nanotube composite fibers

机译：碳纳米管的增强效率及其对聚醚酮/碳纳米管复合纤维中晶体滑移的影响

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摘要

Poly(ether ketone) (PEK)/carbon nanotube (CNT) composite fibers have been produced using dry-jet wet spinning. Carbon nanofibers (CNF), few-walled carbon nanotubes (FWNT), and multi-walled nanotubes (MWNT) have been utilized as nanofillers, with few-walled carbon nanotube loadings as high as 28 wt%. The interfacial strength of the PEK/FWNT and PEK/MWNT fibers were evaluated through the monitoring of the G-mode Raman peak shift as a function of fiber strain. Interfacial shear strengths as high as 14.2 MPa were measured for the PEK/FWNT fiber with 28 wt% CNT loading, a 1320% increase as compared to the PEK/MWNT fiber with 5 wt% loading (1.0 MPa). T-g of the PEK/FWNT fibers increased by 19 degrees C as the FWNT loading was increased from 5 wt% to 28 wt%. A second peak in the tan delta behavior of all PEK/CNT fibers was also observed. This second tan delta peak (T similar to 240 degrees C-250 degrees C) is attributed to the alpha*-cetransition (crystal-crystal slip) in the PEK crystalline regions, and its presence is more pronounced (higher magnitude of tan delta) in all PEK/FWNT fibers as compared to PEK/MWNT and PEK/CNF fibers. FWNTs are restricting the mobility of the amorphous PEK as evidenced by the increasing Tg. Enhanced PEK crystal-crystal slip corresponds to increasing large scale chain mobility in the crystalline regions of the PEK at T-alpha*. We propose a model which correlates the increase in PEK-FWNT interfacial shear strength to an increase in large scale chain mobility where crystal-crystal slip precedes failure of PEK/CNT interface at T-alpha*. for the PEK/FWNT fibers. (C) 2017 Elsevier Ltd. All rights reserved.
机译：聚（醚酮）（PEK）/碳纳米管（CNT）复合纤维已使用干喷湿法纺丝生产。碳纳米纤维（CNF），少壁碳纳米管（FWNT）和多壁纳米管（MWNT）已被用作纳米填料，其中少壁碳纳米管的负载量高达28 wt％。 PEK / FWNT和PEK / MWNT纤维的界面强度通过监测G型拉曼峰位移随纤维应变的变化进行评估。对于具有28 wt％CNT负载的PEK / FWNT纤维，测量的界面剪切强度高达14.2 MPa，与具有5 wt％负载的PEK / MWNT纤维（1.0 MPa）相比，界面剪切强度提高了1320％。随着FWNT载荷从5 wt％增加到28 wt％，PEK / FWNT纤维的T-g增加了19摄氏度。还观察到所有PEK / CNT纤维的tanδ行为的第二个峰值。第二个tanδ峰（T类似于240摄氏度至250摄氏度）归因于PEK晶体区域中的α*过渡（晶体滑移），并且它的存在更加明显（tanδ幅度更大）与PEK / MWNT和PEK / CNF纤维相比，在所有PEK / FWNT纤维中的含量都更高。 TW增加表明，FWNT限制了非晶态PEK的迁移。增强的PEK晶体滑爽度对应于在T-alpha *处PEK晶体区域中大规模链迁移率的提高。我们提出了一个模型，该模型将PEK-FWNT界面抗剪强度的增加与大规模链迁移率的增加相关，其中在T-alpha *处PEK / CNT界面失效之前晶体-晶体滑移。用于PEK / FWNT纤维。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Composites Science and Technology》 |2017年第28期|116-125|共10页
  • 作者

    Newcomb Bradley A.; Chae Han Gi; Thomson Lindsey; Luo Jeffrey; Baek Jong-Beom; Kumar Satish;

  • 作者单位

    Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA;

    Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA|Ulsan Natl Inst Sci & Technol, Sch Mat Sci & Engn, Ulsan 44919, South Korea;

    Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA;

    Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA|Georgia Inst Technol, Renewable Bioprod Inst, Atlanta, GA 30332 USA;

    Ulsan Natl Inst Sci & Technol, Sch Energy & Chem Engn, Ctr Dimens Controllable Organ Frameworks, Ulsan 44919, South Korea;

    Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA|Georgia Inst Technol, Renewable Bioprod Inst, Atlanta, GA 30332 USA;

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  • 正文语种 eng
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  • 关键词

    Nanocomposites; Thermal properties; Interfacial strength; Stress transfer;

    机译：纳米复合材料;热性能;界面强度;应力转移;

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