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相关概念视频

Photoluminescence: Applications01:14

Photoluminescence: Applications

437
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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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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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

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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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Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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在离子液体中的可见光加速光化聚合物.

Arunjunai R S Santha Kumar1,2,3, Stephanie Allison-Logan3, John R Finnegan3

  • 1Rubber Technology Center, Indian Institute of Technology Kharagpur, 721302, WB, India.

ACS macro letters
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概括

离子液体显著提高N,N-二甲基烯胺的可见光光化聚合率. 这种方法可以精确控制聚合物分子量和分散性,从而实现强大的块共聚合物合成.

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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

背景情况:

  • 可见光光化聚合提供了一种可控的聚合物合成方法.
  • 离子液体正在成为多功能溶剂,具有独特的化学反应特性.

研究的目的:

  • 为了研究离子液体对可见光诱导的光化聚合物的影响.
  • 合成N,N-二甲基烯胺聚合物和具有控制特性的阻断共聚合物.

主要方法:

  • N,N-二甲基烯胺在1-乙基-3-甲基利米达乙硫酸盐离子液中的光化聚合物.
  • 合成不同比例的块共聚合物.
  • 使用MALDI-ToF MS进行链末忠实性分析的表征.

主要成果:

  • 与单纯水相比,在离子液体和混合溶剂中观察到的聚合速率常数的显著增加.
  • 实现了对分子量和质量分散率 (Đ) 的精确控制.
  • 证明了区块共聚合物合成过程的稳定性,具有高链端保真性.

结论:

  • 离子液体有效地提高了可见光光电聚合物的速率和控制.
  • 开发的方法是稳固的,适合合成明确的块共聚合物.
  • 高链端忠实性是可以实现的,由MALDI-ToF MS分析证实.