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相关概念视频

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.9K
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...
2.9K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.8K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
2.8K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.5K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.5K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.3K
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...
2.3K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.2K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.2K

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相关实验视频

Updated: Jul 25, 2025

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Published on: January 19, 2016

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可编程复杂的塑形变化聚氧主链液晶弹性体的可编程复杂的塑形变化.

Yuhe Zhang1, Xiuxiu Wang1, Wenlong Yang2

  • 1Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, China.

Molecules (Basel, Switzerland)
|June 28, 2023
PubMed
概括

研究人员开发了具有2D和3D形状改变能力的可编程液晶弹性体 (LCE). 这些新的LCE材料为先进的应用提供可逆的热诱导转变.

关键词:
机械编程过程 机械编程过程聚氧液晶弹性体 聚氧液晶弹性体可编程的形状变形.两个步骤的交叉连接.双向网络内存是双向网络内存.

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Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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Microfluidic Preparation of Liquid Crystalline Elastomer Actuators
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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
  • 软物质物理学 软物质物理学

背景情况:

  • 液晶弹性体 (LCEs) 由于液晶 (LC) 异质性和聚合物网络弹性之间的相互作用而表现出形状变形特性.
  • 控制LC对齐对于指导LCE形状变化至关重要,但目前的方法往往涉及复杂的制造或具有有限的适用性.

研究的目的:

  • 开发一个具有可编程2D和3D形状改变能力的聚氧主链LCE.
  • 克服现有方法的局限性,用于在LCE中空间调节LC对齐.

主要方法:

  • 使用两步交联过程对多域LCE进行机械编程.
  • 在热刺激下描述LCE的结构和形状变化行为.

主要成果:

  • 成功创建了一个具有可编程2D和3D形状变化能力的聚烯主链LCE.
  • 在初始和编程状态之间展示了可逆的,热诱导的形状转换.
  • 形状记忆效应归因于由双交联网络结构建立的双向记忆.

结论:

  • 开发的LCE材料提供可编程和可逆的形状变形.
  • 这一进步扩大了LCE在执行器,软机器人和智能结构等领域的潜在应用.