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相关概念视频

Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.3K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
3.3K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.1K
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.
3.1K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.7K
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...
2.7K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.4K
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...
2.4K
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
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.1K
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...
2.1K

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相关实验视频

Updated: May 12, 2025

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

Published on: September 26, 2016

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在固体基板上的聚合物混合模型的分子动力学.

O E Ayo-Ojo1, M Tsige2, G T Mola1

  • 1School of Chemistry & Physics, University of KwaZulu-Natal, Pietermaritzburg, Private Bag X01, Scottsville 3209, South Africa.

Molecules (Basel, Switzerland)
|May 7, 2025
PubMed
概括

线性和循环聚合物混合物表现出明显的界面行为. 较短的链在接口上倾向于线性聚合物,而较长的链则倾向于循环聚合物,为材料设计提供了洞察力.

关键词:
吸附吸附是一种吸附.接口 接口 接口 接口 接口分子动力学分子动力学聚合物混合物 聚合物混合物

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Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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相关实验视频

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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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Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

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科学领域:

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

背景情况:

  • 了解聚合物混合物在接口上的行为对于材料性能至关重要.
  • 拓差异 (线性与循环) 可以影响聚合物链相互作用和安排.
  • 之前的研究表明,循环聚合物在低能表面的丰富.

研究的目的:

  • 为了研究线性和循环聚合物混合物在限制下的界面行为.
  • 探索链条长度,混合物成分和基质亲和力如何影响接口结构.
  • 提供分子层面的洞察力,补充实验发现.

主要方法:

  • 使用珠子弹模型进行广泛的分子动力学模拟.
  • 研究的系统包括不同的链条长度 (数量级),混合物组成和基质亲和度.
  • 分析重点是线性和循环聚合物链的界面吸附和丰富.

主要成果:

  • 短线性链在接口上优先吸附,特别是当主导或在等极比率时.
  • 较长的线性和循环聚合物链在接口上表现出循环链的优先丰富.
  • 观察到的行为在不同的混合物组成和基质亲和度之间是一致的.

结论:

  • 链拓显著影响受限聚合物混合物的界面组成.
  • 结果将实验观测扩展到受限系统,揭示了基于链条长度的独特吸附行为.
  • 拓设计为涂料,膜和纳米结构中的应用提供了一条调整界面特性的途径.