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首页> 外文期刊>ACS Macro Letters >Visualization of the Necking Initiation and Propagation Processes during Uniaxial Tensile Deformation of Crystalline Polymer Films via the Generation of Fluorescent Radicals
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Visualization of the Necking Initiation and Propagation Processes during Uniaxial Tensile Deformation of Crystalline Polymer Films via the Generation of Fluorescent Radicals

机译：通过产生荧光自由基，在单轴拉伸变形期间可视化颈颈膜的颈颈缩张变形

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摘要

To visualize and simultaneously quantify the necking behavior of crystalline polymer films during uniaxial stretching, tetraarylsuccinonitrile (TASN) moieties were introduced into polymers at the center of the main chain. TASN can produce a relatively stable radical that emits yellow fluorescence in response to mechanical stress. During the uniaxial elongation test of the TASN-centered crystalline polymers, the yellow fluorescence derived from the dissociated TASN radicals was used for microscale observations that showed the orientation of the polymer chains in the stretching direction. Furthermore, by comparing the radical generation in linear and star-shaped TASN-centered crystalline polymers during their tensile deformation, we found that the TASN dissociation ratio is higher in the star-shaped polymer, which has more chains connected to the lamellar crystal. Thus, the microforces generated in the amorphous region during uniaxial stretching were probed via the use of TASN, which allowed a direct visualization of the necking initiation and propagation processes as well as a quantification via electron paramagnetic resonance spectroscopy.
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  • 来源
    《ACS Macro Letters》 |2021年第5期|共5页
  • 作者

    Kato Sota; Aoki Daisuke; Oikawa Kazusato; Tsuchiya Kousuke; Numata Keiji; Otsuka Hideyuki;

  • 作者单位

    Tokyo Inst Technol Dept Chem Sci &

    Engn Tokyo 1528550 Japan;

    Tokyo Inst Technol Dept Chem Sci &

    Engn Tokyo 1528550 Japan;

    Kyoto Univ Dept Mat Chem Grad Sch Engn Kyoto 6158510 Japan;

    Kyoto Univ Dept Mat Chem Grad Sch Engn Kyoto 6158510 Japan;

    Kyoto Univ Dept Mat Chem Grad Sch Engn Kyoto 6158510 Japan;

    Tokyo Inst Technol Dept Chem Sci &

    Engn Tokyo 1528550 Japan;

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  • 正文语种 eng
  • 中图分类 有机化学;
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