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相关概念视频

Organic Compounds03:02

Organic Compounds

51.4K
All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
51.4K
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.2K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.2K
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
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
Polymers: Defining Molecular Weight01:01

Polymers: Defining Molecular Weight

2.9K
Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight.  So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
The number average molecular weight (Mn) is the summation of the number...
2.9K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

1.9K
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
1.9K

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相关实验视频

Updated: Jun 29, 2025

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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有机分子织物 有机分子织物

Andreas Herdlitschka1, Bartosz Lewandowski1, Helma Wennemers2

  • 1Laboratorium für Organische Chemie, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, CH-8093 Zürich.

Chimia
|March 29, 2024
PubMed
概括
此摘要是机器生成的。

研究人员探索有机化合物的分子编织,以创建强大,弹性的材料. 本综述详细介绍了形成交织网络的策略,为具有卓越机械性能的先进纳米结构材料铺平了道路.

关键词:
分子编织是分子编织.纳米结构材料是纳米结构材料.超分子化学 超分子化学拓学是一种拓学.

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Molecular Entanglement and Electrospinnability of Biopolymers
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Molecular Entanglement and Electrospinnability of Biopolymers

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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相关实验视频

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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
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Molecular Entanglement and Electrospinnability of Biopolymers
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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科学领域:

  • 材料科学 材料科学 材料科学
  • 有机化学 有机化学
  • 纳米技术纳米技术

背景情况:

  • 分子编织在材料科学中是一个重大挑战.
  • 创建有机化合物与受控交叉点的交织网络是复杂的.
  • 几乎没有完全有机分子编织的例子.

研究的目的:

  • 审查形成有机分子织物的策略.
  • 突出所产生的纳米结构材料的结构特征.
  • 预测有机分子编织的未来发展.

主要方法:

  • 关于有机分子编织的现有文献的综述.
  • 分析使用的不同合成策略.
  • 报告的有机织物结构特征的表征.

主要成果:

  • 已经确定了几种策略来实现有机化合物的分子编织.
  • 这些纳米结构材料的结构特征已经被阐明.
  • 形成明确和定期的交叉点仍然是一个关键的挑战.

结论:

  • 开创性的研究表明有机分子编织的可行性.
  • 预计进一步的研究将产生更复杂的拓和增强的机械性能.
  • 有机分子织物为具有高弹性,强度和性的先进材料提供了希望.