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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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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...
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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...
2.2K
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...
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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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...
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在双通道金属有机框架中进行分类聚合.

Keat Beamsley1, Nobuhiko Hosono2, Takashi Uemura3

  • 1Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8656, Tokyo, Japan.

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概括

本研究介绍了一种使用双通道金属有机框架 (MOF) 的新型分类聚合策略,以实现聚合物的并行合成和排列. 这种方法使得从简单的单体分子中单步创建复杂的聚合物阵列.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 纳米技术纳米技术

背景情况:

  • 具有可控排列的多种聚合物的并行合成是一个重大挑战.
  • 现有的方法缺乏同时管理单体捕获,分离,反应和产品组织的能力.
  • 金属有机框架 (MOF) 为先进的化学应用提供可调节的结构.

研究的目的:

  • 开发一种新的分类聚合策略,用于聚合物阵列的并行合成.
  • 使用多功能双通道金属有机框架 (MOF) 作为反应平台.
  • 为了在单个步骤中实现同聚合物的受控排列.

主要方法:

  • 合成了一种双通道金属有机框架,[Cu(5-甲基异甲酸) ]n,具有两个不同的通道.
  • 根据MOF通道内的极性和大小,实现了对乙烯基单体的选择性吸附.
  • 在MOF通道内进行了分类单体的现场并行同型聚合.
  • 使用链间交叉连接和MOF模板去除来隔离聚合物阵列.

主要成果:

  • 双通道MOF选择性地分类了不同的乙烯基单体.
  • 在MOF通道内,并行同聚合发生在现场,产生交替的同聚合物单链阵列.
  • 一个二进制聚合物阵列在交叉链接和MOF移除后被成功分离出来.
  • 这种方法在单个步骤中实现了复杂,有序的分子架构.

结论:

  • 开发的分类聚合策略有效地解决了并行合成和受控聚合物排列的挑战.
  • 双通道MOF作为多功能平台,可以从混合单体中创建复杂的分子架构.
  • 这种方法为合成精确排序的聚合物阵列提供了一条新途径,这是传统方法无法实现的.