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首页> 外文期刊>ACS Macro Letters >Chain Tilt and Crystallization of Ethylene Oxide Oligomers with Midchain Defects
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Chain Tilt and Crystallization of Ethylene Oxide Oligomers with Midchain Defects

机译：链倾斜和中间缺陷的环氧乙烷低聚物结晶

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摘要

Many text books and publications do not focus on the necessity of chain tilting in crystalline lamellae of oligomers and polymers, a fundamental aspect of their crystallization already discussed by Flory. Herein we investigate the chain tilt of ethylene oxide oligomers (EOs) containing various midchain defects by WAXS, SAXS and solid state 13C MAS NMR spectroscopy. At low temperatures, one out of the two EO chains of EO9-meta-EO9 and EO11-TR-EO11 containing a 1,3-disubstituted benzene or a 1,4-disubstituted 1,2,3-triazole defect in central position of the oligomer chain forms crystals and the other EO chain as well as the defect remain in the amorphous phase. The aromatic midchain defect of these two oligomers can be incorporated into the crystalline lamella upon heating below Tm. Then, the adjoining amorphous EO chain crosses from the lamellae to the amorphous regions at an angle ξ, which is preordained by the substitution pattern of the aromatic defect, revealing that the chain tilt angle ranges between 36° ≤ ? ≤ 60°.]]>
机译：<！[cdata [ src =] http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/amlccd/2017/amlccd.2017.6.issue-11/acsmacrolett.7b00757/20171115/图像/中/ MZ-2017-00757J_0005.gif“>许多文本书籍和出版物并未专注于低聚物和聚合物的结晶薄片中链倾斜的必要性，其结晶已经通过血液讨论的基本方面。在此，我们研究蜡，淋巴和固态 13℃的环氧化物低聚物（EOS）的链氧倾斜，含有各种中间缺陷 13℃。在低温下，eo 9 - -eo 9 和EO 11 中的两个EO链中的一个。 - 含有1,3-二取代的苯或1,4-二取代的1,2,3-三唑缺陷在低聚物链的中央位置，形成晶体和其他EO链条的1,3-二取代苯或1,4-二取代的1,2,3-三唑缺损随着缺陷留在非形态相中。在加热以下，可以将这两个低聚物的芳族中间缺陷掺入结晶薄片中，然后在 t℃下加热。然后，将邻接的非晶态EO链从薄片以角度ψ交叉，其以芳族缺陷的替代图案预先定义，揭示链倾斜角度在36°≤α之间。 ≤60°。]]>

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  • 来源
    《ACS Macro Letters》 |2017年第11期|共5页
  • 作者

    Martin Pulst; Christian Schneemann; Pawe? Ruda; Yury Golitsyn; Ann-Kathrin Grefe; Bernd Stühn; Karsten Busse; Detlef Reichert; J?rg Kressler;

  • 作者单位

    Faculty of Natural Sciences II Martin Luther University Halle-Wittenberg D-06099 Halle (Saale) Germany;

    Faculty of Natural Sciences II Martin Luther University Halle-Wittenberg D-06099 Halle (Saale) Germany;

    Faculty of Natural Sciences II Martin Luther University Halle-Wittenberg D-06099 Halle (Saale) Germany;

    Faculty of Natural Sciences II Martin Luther University Halle-Wittenberg D-06099 Halle (Saale) Germany;

    Institute of Condensed Matter Physics Technische Universit?t Darmstadt D-64289 Darmstadt Germany;

    Institute of Condensed Matter Physics Technische Universit?t Darmstadt D-64289 Darmstadt Germany;

    Faculty of Natural Sciences II Martin Luther University Halle-Wittenberg D-06099 Halle (Saale) Germany;

    Faculty of Natural Sciences II Martin Luther University Halle-Wittenberg D-06099 Halle (Saale) Germany;

    Faculty of Natural Sciences II Martin Luther University Halle-Wittenberg D-06099 Halle (Saale) Germany;

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  • 正文语种 eng
  • 中图分类 有机化学;
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