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相关概念视频

Elasticity01:12

Elasticity

4.9K
Elasticity is the ability of an object to withstand the effects of distortion and to return to its original size and shape once the forces causing deformation are removed. When an elastic material deforms under the action of an external force, it experiences internal resistance to the deformation. However, if no external force is applied, it returns to its original state.
The elasticity of an object can be described by a stress-strain curve, which represents the relationship between stress...
4.9K
Phase Diagrams02:39

Phase Diagrams

50.3K
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Elasticity in Concrete01:20

Elasticity in Concrete

363
Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear...
363
Phase Transitions02:31

Phase Transitions

23.2K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
23.2K
Elastic Potential Energy01:01

Elastic Potential Energy

19.7K
Elastic potential energy is the energy stored as a result of the deformation of an elastic object, such as the stretching of a spring. An object is elastic if it returns to its original shape and size after being deformed. 
Potential energy is also associated with the elastic force exerted by an ideal spring. The work done by this force can be represented as a change in the elastic potential energy of the spring. Thus, the work done by a perfectly elastic spring, in one dimension, depends...
19.7K
Strain and Elastic Modulus01:15

Strain and Elastic Modulus

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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
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相关实验视频

Updated: Feb 7, 2026

Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites

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对于生物基弹性体,以相分离驱动的同时高弹性和再挤出能力.

Yeqing Li1, Shuangjian Yu1, Huawei Qiao1

  • 1Institute of Emergent Elastomers, Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China.

ACS applied materials & interfaces
|February 6, 2026
PubMed
概括

这项研究引入了可回收的生物基热塑性弹性体,通过组合动态共价交叉链接和相位分离. 这些新材料具有出色的弹性和可回收性,解决了可持续聚合物开发的关键挑战.

关键词:
基于生物的弹性体.动态的共价键是动态的共价键可挤出性 能够挤出性高弹性的高弹性.阶段分离的阶段分离.

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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
  • 可持续材料 可持续材料

背景情况:

  • 耐热聚合物带来了回收的挑战,而以石油为基础的聚合物有助于环境负担.
  • 由于交叉连接密度,现有的生物基弹性体面临弹性和可回收性之间的权衡.
  • 对高性能,可回收和生物基弹性体的需求对于可持续性至关重要.

研究的目的:

  • 开发一种用于合成可回收生物基热塑性弹性体的新方法.
  • 为了克服交叉链接生物基弹性体的弹性-可回收性权衡.
  • 为可持续的弹性体生产创造一个可扩展的路线.

主要方法:

  • 阶段分离调制与动态共价交联的集成.
  • 在EPDM矩阵中使用M-g-EVA作为兼容剂在生物基单体 (氧化大豆油和二元酸) 的一级现场聚合.
  • 通过受控的聚合和交叉连接,形成一个稳定的多相网络 ("连续 - 接口 - 分散阶段").

主要成果:

  • 合成的生物基热塑性弹性体表现出增强的弹性性能,包括出色的爬行阻力和改进的低温压缩集.
  • 材料表现出卓越的循环疲劳稳定性,在300个循环后,压力保留率超过97%.
  • 聚合物网络允许连续挤出和再加工,由于动态共价键和EPDM滑,在五个循环后保留了超过85%的机械性能.

结论:

  • 已经建立了一种可扩展和有效的方法来生产高性能,可回收的生物基热塑性弹性体.
  • 该研究为开发下一代可持续弹性体提供了有价值的设计见解.
  • 开发的材料为以石油为基础的聚合物提供了一个有希望的替代品,解决了环境问题和性能要求.