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相关概念视频

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.7K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.8K
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...
2.8K
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

2.4K
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...
2.4K
Polymers02:34

Polymers

35.7K
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...
35.7K
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.
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.5K
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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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates

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聚合物单位图:在图中提升可解释性 神经网络机器学习对于有机聚合物半导体材料的机器学习

Xinyue Zhang1, Ye Sheng1, Xiumin Liu1,2

  • 1Department of Materials Science and Engineering & Guangdong Provincial Key Laboratory of Computational Science and Material Design, Southern University of Science and Technology, Shenzhen 518055, PR China.

Journal of chemical theory and computation
|March 29, 2024
PubMed
概括

一个新的聚合物单位图表表示增强了对有机聚合物和宏分子的图形神经网络 (GNN) 分析. 这种方法提高了可解释性和效率,揭示了有机半导体中的结构属性关系.

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Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering
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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
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Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering
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Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering

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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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科学领域:

  • 材料科学 材料科学 材料科学
  • 计算化学计算化学
  • 数据科学数据科学数据科学

背景情况:

  • 图形神经网络 (GNN) 对以数据为中心的材料科学至关重要,但与聚合物和宏分子数据相斗争.
  • 现有的GNN模型在复杂有机结构的解释性和计算效率方面面临挑战.
  • 为了有效的GNN应用,需要聚合物和宏分子的专用图形表示.

研究的目的:

  • 介绍一种新的粗粒度图表表示法,即聚合物单位图,用于聚合物和宏分子.
  • 加强使用GNN的有机半导体 (OSC) 聚合物的结构性质关系的分析.
  • 提高大型有机分子GNN模型的解释性和计算效率.

主要方法:

  • 开发并实施了聚合物单位图,一种粗粒度表示方法.
  • 将聚合物单位图形集成到GNN模型中进行数据分析.
  • 分析了一个有机半导体 (OSC) 材料数据库,以探索结构-属性关系.

主要成果:

  • 聚合物单位图表有效地代表了用于 GNN 分析的聚合物和宏分子.
  • 揭示了与OSC聚合物中分支链工程,化和捐赠者-接受者效应相关的复杂结构-属性关系.
  • 在训练时间中实现了98%的减少,并将分子图表表示模型最小化.

结论:

  • 聚合物单元图表成功地将聚合物单元集成到GNN框架中.
  • 能够更准确地分析和理解有机聚合物和宏分子.
  • 有助于可视化聚合物单位和目标属性之间的关系.