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相关概念视频

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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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.9K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.4K
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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.2K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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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 of a...
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电离子催化剂战略使超快速和受控的聚合和高效的去聚合成为可能,实现循环聚合物经济.

Kang Chen1,2,3, Yueming Wu1,2,4, Minzhang Chen2,4

  • 1State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, P.R. China.

Angewandte Chemie (International ed. in English)
|November 4, 2025
PubMed
概括

化学家们开发了一种用于氨基酸 (AA) 聚合物的超快速合成的新型阴离子催化剂. 这种催化剂还可以有效地循环回收AA聚合物,为聚合物废物提供可持续的解决方案.

关键词:
氨基酸聚合物中的氨基酸.电离催化剂策略 电离催化剂策略循环聚合物经济是循环的在NCA的聚合物中,NCA的聚合物.超快速和受控的聚合.

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科学领域:

  • 聚合物化学 聚合物化学
  • 可持续材料 可持续材料

背景情况:

  • 越来越多的聚合物废物需要化学可回收的解决方案.
  • 氨基酸 (AA) 聚合物对于循环聚合物经济至关重要.
  • 现有的N-碳素化 (NCA) 聚合方法对AA聚合物缺乏分子量控制,并遭受副作用.

研究的目的:

  • 开发一种高效的阴离子催化剂战略,用于超快速的,可控的AA聚合物合成.
  • 为了使AA聚合物的闭环回收利用开发的催化剂.
  • 证明催化剂在聚合和脱聚合中的可扩展性和实际应用.

主要方法:

  • 开发一种用于N-碳素化 (NCA) 聚合的新型阴离子催化剂策略.
  • 与各种有机强基启动剂进行兼容性测试.
  • 乙烯基聚合物的克图尺度 (∼120 g) 合成.
  • 对催化剂在脱聚合AA聚合物回归氨基酸中的效率的评估.
  • 评估催化剂的可回收性.

主要成果:

  • 在几分钟内实现了超快速的,分子量控制的AA聚合物合成.
  • 证明AA聚合物的高效脱聚合成氨基酸,恢复率为85.9%.
  • 证实了阴离子催化剂的定量可回收性.

结论:

  • 开发的阴离子催化剂战略为AA聚合物合成和回收利用提供了强大,可扩展和高效的方法.
  • 这种方法在推进循环聚合物经济和可持续地管理聚合物废物方面具有重大潜力.
  • 催化剂有助于在聚合和脱聚合化学中的实际应用.