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相关概念视频

Radical Formation: Overview01:03

Radical Formation: Overview

2.0K
A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
2.0K
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

2.3K
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...
2.3K
Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

1.9K
The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
1.9K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.4K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.0K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.0K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.6K
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.
7.6K

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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst

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立体正规基聚合物使选择性旋转转移成为可能.

Hyunki Yeo1, Cole C Sorensen2, Hamas Tahir1

  • 1Charles D. Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA.

Science advances
|March 21, 2025
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种新的聚合物用于自旋电子设备. 这种材料可以实现高效的长距离旋转传输,而无需传统的兴奋剂,从而提高下一代信息存储的性能和稳定性.

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3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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科学领域:

  • 材料科学 材料科学 材料科学
  • 有机电子 有机电子
  • 这就是Spintronics.

背景情况:

  • 传统的电子设备面临性能和能源效率的限制.
  • 目前有机自旋电子材料 (金属,合聚合物) 存在稳定性和性能问题.
  • 兴奋剂通常需要用于有机设备中的旋转操纵.

研究的目的:

  • 设计一种新的聚合物,用于在自旋电子器件中高效,稳定的自旋传输.
  • 克服现有材料的局限性和传统的兴奋剂要求.
  • 探索具有持久基的立体规律聚合物的潜力,用于先进的信息存储.

主要方法:

  • 利用立体选择性阴性聚合来合成一种新型聚合物.
  • 在每个聚合物重复单元中加入一个稳定的持久基.
  • 研究了聚合物立体化学对旋转-旋转相互作用和对齐的影响.

主要成果:

  • 实现了有效旋转运输所需的远程订单.
  • 证明了高导电性和长的旋转扩散长度.
  • 展示了材料的可加工性和稳定性,克服了兴奋剂要求.
  • 确定了一种新的材料类别:具有持久中性基的立体规律聚合物.

结论:

  • 具有持久中性基的立体规律聚合物是旋转电子学的一个可行的新材料类.
  • 这种方法可以实现对下一代信息存储至关重要的长距离旋转操纵.
  • 与现有的有机自旋电子材料相比,开发的聚合物提供了卓越的性能和稳定性.