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相关概念视频

Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.7K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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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,...
2.1K
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
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...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.0K
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...
2.0K
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...
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Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties
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摄影交联聚氨含凝聚合物电解质通过自由基聚合法电解质.

Fatmanur Uyumaz1, Yerkezhan Yerkinbekova2, Sandugash Kalybekkyzy2,3

  • 1Department of Chemistry, Faculty of Science, Marmara University, Istanbul 34722, Turkey.

Polymers
|September 28, 2024
PubMed
概括

新型交联凝聚合物电解质 (GPEs) 为离子电池提供了增强的离子导电性和稳定性. 这些先进的GPE证明了卓越的性能和安全性,为下一代灵活的储能系统铺平了道路.

关键词:
紫外线的交叉连接自由基聚合的自由基聚合.凝聚合物的电解质凝.离子电池是一种离子电池.聚氨乙烯酸烯酸盐的使用情况.聚氨甲基烯酸盐的多重氨.

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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
  • 聚合物科学 聚合物科学

背景情况:

  • 开发先进的电解质对于提高离子电池性能和安全至关重要.
  • 当前的电解质面临着稳定性,离子导电性和电解质泄漏方面的挑战.
  • 凝聚合物电解质 (GPEs) 为更安全,更有效的储能提供了一个有前途的替代方案.

研究的目的:

  • 为离子电池应用合成新型交联凝聚合物电解质 (GPEs).
  • 研究开发的GPE的结构,电化学和热性能.
  • 为了评估GPEs在离子硬币电池中的性能.

主要方法:

  • 使用聚氨烯酸盐 (PUA),聚氨甲烯酸盐 (PUMA),乙烯基酸 (VPA) 和bis[2-(methacryloyloxy) ethyl]酸盐 (BMEP) 通过UV启动的自由基聚合制造交联的GPE的制造.
  • 离子导电性,电化学稳定性和机械/热性质的表征.
  • 使用开发的GPE,组装和测试基于LiFePO4阴极的硬币电池.

主要成果:

  • 与商业分离器相比,新的交联GPE表现出明显更高的离子导电性 (1.83 × 10-3 S cm-1).
  • GPE表现出极好的机械和热稳定性,减少了电解质泄漏和改善了液体保留.
  • 硬币电池显示出高可逆容量 (在0.1°C时为149mA hg-1),接近100%的库伦比克效率,并在循环后保留了91.5%的容量.
  • 电化学稳定性观察到高达3.78V.

结论:

  • 开发的交联GPE为离子电池提供卓越的离子导电性,增强的稳定性和改进的安全功能.
  • 独特的交联结构有效地管理电解质保留并减少泄漏.
  • 这些GPE显示出开发高性能和安全的灵活储能系统的巨大潜力.