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相关概念视频

Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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...
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Polymers: Molecular Weight Distribution01:10

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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在动态共价聚合物网络中的分子弹.

Ibrahim Oladayo Raji1, Mary Eisenhart1, Roshan Lama1

  • 1Department of Chemistry and Biochemistry, Miami University, 651 E High St, Oxford, Ohio 45056, United States.

Macromolecules
|March 2, 2026
PubMed
概括
此摘要是机器生成的。

具有弹式芳香折叠体的新型动态聚合物显示出增强的能量消散和自我愈合. 这些材料利用动态Diels-Alder交叉连接,为先进的应用提供卓越的性能.

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科学领域:

  • 聚合物化学 聚合物化学
  • 材料科学 材料科学 材料科学
  • 超分子化学 超分子化学

背景情况:

  • 动态聚合物对于需要能量消散和阻尼的先进应用至关重要.
  • 芳香折叠材料为材料设计提供独特的弹状特性.

研究的目的:

  • 研究将芳香折叠材料纳入聚合物网络的影响.
  • 评估动态交叉连接对材料性能的影响.

主要方法:

  • 合成的聚合物网络与芳香折叠体.
  • 使用了动态的迪尔斯-阿尔德 adducts 和静态的交叉连接器.
  • 具有机械,自我愈合和减湿的特性.

主要成果:

  • 较短的聚合物链和增加的芳香折叠分子单元改善了性能.
  • 动态Diels-Alder交叉连接显著提高了机械和阻尼性能.
  • 观察到foldamers和动态交叉链之间的协同效应.

结论:

  • 基于芳香折叠分子的聚合物网络表现出优越的能量消散和自我愈合.
  • 动态交叉连接是解锁先进材料功能的关键.
  • 这些发现为新型高性能聚合物铺平了道路.