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相关概念视频

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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Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light
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可调节的机械互锁半晶体网络

Wen-Yu Qin1, Chen-Yu Shi1, Guo-Quan Liu2

  • 1Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P. R. China.

Angewandte Chemie (International ed. in English)
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概括

这项研究通过将机械化学整合到半晶体网络中,引入了具有增强机械性能的先进聚合物. 新材料实现了卓越的强度,性和弹性,克服了动态聚合物系统中以前的权衡.

关键词:
机械化学 机械化学动态材料 动态材料高性能的弹性体.有协同作用的相互作用.热/光驱动的启动方式

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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Design, Surface Treatment, Cellular Plating, and Culturing of Modular Neuronal Networks Composed of Functionally Inter-connected Circuits
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科学领域:

  • 聚合物科学 聚合物科学
  • 材料化学 材料化学
  • 机械化学 机械化学

背景情况:

  • 动态化学使高性能聚合物能够用于先进的应用.
  • 聚合物中的非共价键在性和弹性之间产生了权衡.
  • 现有的聚合物网络努力平衡机械强度,性和弹性.

研究的目的:

  • 为了同步增强聚合物的机械强度,性和弹性.
  • 为了克服非共价性牺牲键介导的能量消散的局限性.
  • 开发具有改进的再加工能力和执行器应用潜力的聚合物.

主要方法:

  • 将机械化学纳入传统的半晶聚合物网络.
  • 风学测试用于分析材料属性.
  • 全原子分子动力学模拟以了解机械行为.

主要成果:

  • 在机械强度,性和弹性方面实现了同步增强.
  • 在形宏循环中结晶域的解离,归因于增强的特性.
  • 通过可逆的纳米晶体领域和环滑动效应证明了瞬时的弹性.
  • 由于多个动态组件,在温和条件下表现出良好的再加工能力.

结论:

  • 机械互锁站点和可调节的晶体领域的协同效应提高了材料性能.
  • 提供了全面增强聚合物材料性能的指南.
  • 机械互锁的半晶体聚合物显示出热/光驱动器应用的潜力.