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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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光协调聚合物单晶,具有可调节的弹性-塑性转换.

Jia-Hui Zhang1, Yu-Xia Li1, Kai-Ge Gao2

  • 1Key Laboratory of Cluster Science of the Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 102488, China. zishuoyao@bit.edu.cn.

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概括

研究人员开发了新的1D协调聚合物,可以控制地曲. 连接物修饰调整机械响应从弹性到塑料,使灵活的光电子学.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 无机化学 无机化学
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 控制复杂单晶体中的机械反应是很困难的.
  • 协调聚合物提供可调节的特性,但实现机械控制是具有挑战性的.

研究的目的:

  • 设计和合成可控制机械反应的 (II) 协调聚合物.
  • 为了研究晶体结构和机械行为之间的关系.
  • 探索这些材料的发光特性.

主要方法:

  • 合成一系列同质的1D ((II) 协调聚合物.
  • 系统地修改基于伊米达的配体.
  • 在外部负荷下进行机械试验.
  • 光发光光谱学. 光发光光谱学.

主要成果:

  • 在协调聚合物中实现可控曲.
  • 通过通过连接体设计改变金属与金属的分离来调整机械反应 (对塑料有弹性).
  • 确定了金属-金属重复距离和弹性应变之间的反向相关性.
  • 观察到稳定的蓝色光发光.

结论:

  • 成功合成了具有可调节机械性能的协调聚合物.
  • 连接物修饰是控制机械反应和实现所需性质的关键.
  • 这些材料显示出灵活的光电子应用和光学波导的潜力.