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相关概念视频

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.9K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.9K
Polymers02:34

Polymers

35.8K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
35.8K
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

3.0K
Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
3.0K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.1K
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
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
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.4K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
3.4K

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相关实验视频

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Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
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Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides

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含有主要组元素的无形多孔有机聚合物.

Zhikai Zhang1, Zhaoxin Liu1, Cece Xue1

  • 1School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China.

Communications chemistry
|December 11, 2023
PubMed
概括

主组元素通过调整其特性并使新的合成策略成为可能,增强无形多孔有机聚合物 (aPOPs). 本综述涵盖了MG-aPOP研究的最新进展,挑战和未来方向.

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

背景情况:

  • 无形多孔有机聚合物 (aPOPs) 是由刚性有机单元构建的高度交联的聚合物.
  • 由于其丰富的结构和特性,它们提供了多样化的应用.

研究的目的:

  • 审查主要集团 (MG) -aPOPs最近的进展.
  • 突出主要组元素在调整aPOP属性和合成中的作用.
  • 讨论MG-aPOP发展当前的挑战和潜在的解决方案.

主要方法:

  • 对最近关于将主要组元素纳入aPOPs的研究进行文献综述.
  • 对MG-aPOPs的合成策略和表征技术的分析.

主要成果:

  • 主组元素提供了独特的方法来修改aPOP的结构和属性.
  • 整合主要组元素为aPOPs提供了新的合成途径.
  • 最近的进展已经扩大了MG-aPOPs的库,提供了定制的功能.

结论:

  • MG-aPOPs是先进材料开发的一个有希望的领域.
  • 需要进一步的研究来克服合成和表征挑战.

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  • 未来的工作应该专注于创新的策略,以充分利用MG-aPOP的潜力.