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相关概念视频

Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.5K
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.
3.5K
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
Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

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In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
692
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.4K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.4K
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
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

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相关实验视频

Updated: Jul 16, 2025

Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy
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Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy

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强吸附聚合物系统的结构:计算机模拟研究

Patrycja Olczyk1, Andrzej Sikorski2

  • 1Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland.

Materials (Basel, Switzerland)
|September 9, 2023
PubMed
概括

计算机模拟揭示了聚合物薄膜如何形成. 在低温下,高聚合物度增加会导致链体更大,因为链间相互作用,这是聚合物结构研究的关键发现.

科学领域:

  • 聚合物科学 聚合物科学
  • 计算化学计算化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 了解薄聚合物薄膜的结构对于材料科学至关重要.
  • 大分子吸附会影响膜的特性.
  • 计算机模拟为研究复杂的聚合物系统提供了强大的工具.

研究的目的:

  • 为了研究二维聚合物薄膜的宏分子结构.
  • 探索温度,链条长度和度对薄膜结构的影响.
  • 阐明聚合物薄膜形成中的链间相互作用的作用.

主要方法:

  • 为二维聚合物系统开发粗粒度模型.
  • 应用一个高效的蒙特卡洛模拟算法.
  • 使用一个采样算法,结合Verdier-Stockmayer,Pivot和声誉移动.

主要成果:

  • 链条大小随着低温度的增加而增加.
  • 较高的温度导致链条尺寸较小,与度相反.
  • 链间相互作用显著影响观察到的宏分子结构.

结论:

关键词:
蒙特卡洛方法 蒙特卡洛方法格子模型的格子模型.聚合物的崩.聚合物薄膜是一种聚合物薄膜.聚合物化的聚合物.

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  • 这项研究提供了关于聚合物薄膜自组装的见解.
  • 温度和度是控制聚合物链形状的关键因素.
  • 链间的力量在确定吸附聚合物薄膜的结构方面发挥着主导作用.