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相关概念视频

Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.2K
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,...
2.2K
Intermolecular Forces03:13

Intermolecular Forces

61.3K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
61.3K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.4K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.4K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.1K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.1K
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

15.1K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
15.1K
Molecular Shape and Polarity03:37

Molecular Shape and Polarity

62.2K
Dipole Moment of a Molecule
62.2K

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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自愈的多聚 (离子液体) 聚合物由极力和双极力驱动的共聚物.

Samruddhi Gaikwad1, Jiahui Liu1, Nyx Mashkow1

  • 1Department of Materials Science and Engineering, Clemson University, Clemson, SC, 29634, USA.

Angewandte Chemie (International ed. in English)
|June 30, 2025
PubMed
概括

在聚合物中联地将离子液体纳入聚合物增强了自我愈合特性. 较长的形尾巴和受控的相互作用改善了可持续能源应用的材料回收.

科学领域:

  • 聚合物科学 聚合物科学
  • 材料化学 材料化学
  • 超分子化学 超分子化学

背景情况:

  • 基于烯酸的共聚合物通过范德瓦尔斯 (vdW) 相互作用表现出自我愈合.
  • 协同结合的离子液体 (ILs) 对这些相互作用和自我愈合的影响在很大程度上是未知的.

研究的目的:

  • 研究多离子液体共聚合物 (PILCs) 如何影响VDW相互作用和机械/电气性能.
  • 确定IL阴离子-离子对和异形尾巴长度在自我愈合中的作用.

主要方法:

  • 合成PILCs从五化和基于伊米达的IL单体,具有不同的异形尾巴.
  • 使用2D NMR (1H-1H,19F-19F NOESY),FTIR和分子动力学 (MD) 模拟的表征.

主要成果:

  • 发现交替/随机的PILC拓能够促进自我愈合.
  • 阴离子-阴离子部分改变性-σ-锁相互作用.
  • 较长的形尾巴增加了阴离子-离子的移动性,从而导致更快的机械损伤恢复.

结论:

  • 通过共聚合物组成精确控制双极和离子相互作用,使PILCs能够自我愈合.
关键词:
二极 - 离子相互作用聚离子液体) 聚合物共聚物.这是一种自我愈合的疗法.

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  • 这些发现为设计可持续,机械弹性材料的能源储存和收获提供了途径.