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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

2.4K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
2.4K
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,...
2.1K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.5K
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...
2.5K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.3K
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...
2.3K

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Updated: Jun 23, 2025

Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers
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反应性固体聚合物层:从单一的聚合物到不同的化接口.

Mingyu Ma1, Xing Guo1, Peng Wen1

  • 1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200433, China.

Angewandte Chemie (International ed. in English)
|June 19, 2024
PubMed
概括

研究人员为金属电池阳极开发了新的聚合物涂层. 这些人工固体电解质介相 (SEI) 层通过创建一个保护性的混合聚合物-无机接口来提高电池的稳定性和性能.

关键词:
金属电池电池的使用情况美国海军突击队.这是一种聚合物共聚物.在这种情况下,的化物.光催化作用的光催化作用

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 聚合物化学 聚合物化学

背景情况:

  • 固体电解质间相 (SEI) 稳定性对于可充电金属电池 (LMB) 的性能至关重要.
  • 控制SEI结构和化学是提高电解质-电极接口稳定的关键.
  • 现有的方法在实现统一和强大的人工SEI层方面面临挑战.

研究的目的:

  • 在金属阳极上开发人工SEI层的按需合成方法.
  • 创建一个混合聚合物-无机交相,具有增强的物理和电化学特性.
  • 为了提高金属电池的稳定性,库伦比效率和循环行为.

主要方法:

  • 采用光控制的共聚合来合成硫尼尔聚合物.
  • 将这些聚合物应用于金属阳极上的人工SEI层.
  • 采用模型反应和结构特征来分析相间形成.

主要成果:

  • 从单个组件中实现了混合聚合物-无机交相的即时形成,其聚合物丰富的顶部和LiF强化的底层.
  • 将SEI赋予了理想的特性,包括机械强度,灵活性和高离子导电性.
  • 证明了长时间稳定沉积,高库伦比效率和改善循环性能.

结论:

  • 反应性聚合物可以有效地作为多功能涂层来稳定金属阳极.
  • 开发的基于聚合物的人工SEI为LMBs的电极-电解质接口挑战提供了有希望的解决方案.
  • 这种单一到分歧的策略为设计先进的电池材料提供了一个新的途径.