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相关概念视频

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

3.7K
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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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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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...
2.4K
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

3.1K
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...
3.1K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

4.6K
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.
4.6K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

3.1K
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...
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Polymers02:34

Polymers

40.3K
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...
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相关实验视频

Updated: Jan 10, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

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有关活动的聚合物系统:恒星与线性链.

Aleksandr I Buglakov1,2, Prabha Chuphal3, Vladimir Yu Rudyak4

  • 1Semenov Federal Research Center for Chemical Physics, Kosygina, 4, 119991 Moscow, Russia.

Molecules (Basel, Switzerland)
|November 27, 2025
PubMed
概括

活性聚合物中的相关活性导致显著的拉伸和独特的动态,与非相关系统不同. 这一发现对于理解活性聚合物的行为和建模实验观测至关重要.

关键词:
活跃的布朗粒子是什么?有活性物质的活性物质.有活性聚合物的活性聚合物.与活动相关的相关活动.旋转半径 旋转半径星级聚合物 星级聚合物拉伸拉伸是一种拉伸.

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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of 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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Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions
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Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions

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相关实验视频

Last Updated: Jan 10, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of 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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Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions
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Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions

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科学领域:

  • 聚合物物理 聚合物物理
  • 软物质物理学 软物质物理学
  • 统计力学 统计力学

背景情况:

  • 活性聚合物表现出由内部能耗驱动的复杂行为.
  • 恒星拓影响了聚合物构成和动态.
  • 了解单体活性相关性是预测活性聚合物行为的关键.

研究的目的:

  • 研究相关的单体活性和恒星拓对活性聚合物的结构和动态的影响.
  • 为了比较相关的活性聚合物恒星与非相关的活性布朗粒子 (ABP) 恒星的行为.

主要方法:

  • 使用分子动力学模拟.
  • 在不同的活性相关性下分析活性星聚合物的结构和动态特性.

主要成果:

  • 相关活性在中间活性水平上诱导明星聚合物显著拉伸.
  • 观察到由协调的手臂运动驱动的不同,超稳定的状态之间的过渡.
  • 由于相关活动,出现了新的集体动态.

结论:

  • 活性相关性在确定活性聚合物的结构和动态方面发挥着关键作用.
  • 观察到的现象与在活性寡合体中的实验发现一致.
  • 精确建模活性聚合物需要包括活性相关性.