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相关概念视频

Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Elastin is Responsible for Tissue Elasticity01:12

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Elastic fiber contains the protein elastin along with lesser amounts of other proteins and glycoproteins. The main property of elastin is that it will return to its original shape after being stretched or compressed. Elastic fibers are prominent in elastic tissues found in skin and the elastic ligaments of the vertebral column.
Ligaments and tendons are made of dense regular connective tissue, but in ligaments not all fibers are parallel. Dense regular elastic tissue contains elastin fibers and...
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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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相关实验视频

Updated: May 1, 2026

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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编程液晶弹性体以实现多步双向可变性

Yuxing Yao1,2, Atalaya Milan Wilborn3, Baptiste Lemaire3

  • 1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA.

Science (New York, N.Y.)
|December 5, 2024
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概括
此摘要是机器生成的。

研究人员开发出一种新型的液晶弹性体,能够进行双向运动,呈现两种相反的变形模式. 在软材料科学中的这一突破使得可扩展的复杂转变成为先进的应用.

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科学领域:

  • 材料科学
  • 软物质物理学
  • 聚合物化学

背景情况:

  • 双向性,即两个相反方向的运动,在自然界中很普遍,但在传统的软材料中很难实现.
  • 现有的软材料通常需要复杂的混合设计来实现双向变形,这限制了它们的实际应用.

研究的目的:

  • 设计和合成具有双向运动的新型液晶弹性体 (LCE).
  • 研究LCE中中相位过渡和由此产生的变形模式之间的关系.

主要方法:

  • 采用了中位素自组合,聚合物链弹性和聚合诱导应激的组合.
  • 设计LCE表现出两种不同的中相:雪佛龙 smectic C (cSmC) 和 smectic A (SmA).
  • 研究了cSmC-SmA同位素相转换以诱导和分析变形行为.

主要成果:

  • 在LCE中实现双向运动,显示相反的变形模式,如连续收缩/扩张和扭转/倾斜.
  • 在cSmC-SmA同位相过渡过程中观察到微观结构中应变场的异常反转.
  • 在宏观尺度上产生高频非单调的振荡和可扩展的高斯转换.

结论:

  • 开发的LCE通过受控的中相过渡成功表现出可扩展的双向运动.
  • 这项工作为设计具有复杂可编程变形能力的软材料提供了新的途径.
  • 这些发现对机器人,执行器和适应性结构有潜在影响.