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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...
2.8K
Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

5.2K
Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
5.2K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.4K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
3.4K

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Updated: Jun 23, 2025

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators
12:04

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

Published on: May 20, 2018

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液晶聚合物执行器具有复杂和多重执行.

Xiaoyu Zhang1, Jia Wei1, Lang Qin1

  • 1Department of Materials Science & State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, China. weijia@fudan.edu.cn.

Journal of materials chemistry. B
|June 25, 2024
PubMed
概括
此摘要是机器生成的。

液晶聚合物 (LCP) 是软执行器的先进材料,通过可控对齐和可重编程特性,可实现复杂和多重的执行. 研究重点是改进LCP执行器设计和制造,用于智能生物医学应用.

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Last Updated: Jun 23, 2025

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators
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Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

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Fabrication of Carbon-Based Ionic Electromechanically Active Soft Actuators
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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物科学 聚合物科学
  • 生物医学工程 生物医学工程

背景情况:

  • 可变形液晶聚合物 (LCPs) 结合了聚合物网络弹性与中质异构性.
  • 在生物医学软执行器应用中,越来越多地研究LCP.
  • 可控制的中位素对齐,复杂的几何形状和可重编程性是先进的LCP执行器的关键.

研究的目的:

  • 对复杂和多重执行的LCP执行器的进步进行审查.
  • 专注于介质层对齐,几何控制和可重新编程的LCP材料.
  • 讨论智能LCP执行器的制造方法和未来趋势.

主要方法:

  • 对LCP执行器的现有文献的审查.
  • 在LCPs中执行机制的分析.
  • 讨论影响LCP执行器复杂性的制造技术.

主要成果:

  • 具有可控制的中位素对齐和几何形状的LCP执行器可以实现复杂的执行.
  • 可重新编程的LCP材料,利用动态网络或形状记忆效果,允许多次执行.
  • 制造方法对LCP执行器的可实现复杂性有重大影响.

结论:

  • 液晶电路执行器为复杂的生物医学应用提供了显著的潜力.
  • 制造和材料设计的进一步发展对于创建更智能的LCP执行器至关重要.
  • 本综述强调了LCP执行器技术未来研究的关键领域.