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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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利用光聚合来调节液晶网络的启动.

Marco Turriani1,2, Niccolò Cosottini1, Neri Fuochi1,3

  • 1LENS (European Laboratory for Non-Linear Spectroscopy) Via Nello Carrara 1, 50019 Sesto Fiorentino (FI), Italy. daniele.martella@unifi.it.

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概括

本研究比较了用于执行器开发的两种类型的光响应液晶网络 (LCN). 混合主链/侧链LCN表现出优越的光激活张力,为人工肌肉提供了增强的性能.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 软机器人软机器人 软机器人软机器人

背景情况:

  • 液晶网络 (LCN) 对于开发软机器人和人工肌肉等执行器至关重要.
  • LCNs以快速的动力学响应外部刺激,这使得它们非常适合动态应用.
  • 目前的研究往往集中在侧链聚合物上,缺乏对具有不同架构的LCN进行详细比较.

研究的目的:

  • 合成和比较具有不同架构的光响应LCN:混合主链/侧链和主链.
  • 评估在光激活时的性能差异,特别是张力发展和收缩能力.

主要方法:

  • 合成混合主链/侧链LCN通过一的烯酸乙烯酸转移反应.
  • 使用两个步骤的aza-Michael添加,然后进行烯酸交叉连接,准备的主要链 LCN.
  • 描述并比较合成的LCN架构的光机械反应.

主要成果:

  • 混合主链/侧链LCN在光激活时表现出优越的张力发展.
  • 合成的混合LCN实现了与传统侧链LCN相比,类似肌肉的力量产生.
  • 这些LCN还表现出增强的收缩能力,超过了常见的主链LCN.

结论:

  • 混合主链/侧链LCN架构为高性能执行器提供了一个有前途的途径.
  • 这种方法将侧链LCN的高力输出与主链LCN的高收缩相结合.
  • 这些发现推动了软机器人和人工肌肉的先进材料的开发.