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相关概念视频

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

2.6K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.6K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.3K
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.
3.3K
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
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

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相关实验视频

Updated: Jun 21, 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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使用人口分割表面的平均场环聚合物速率.

Nathan London1, Siyu Bu1, Britta Johnson1

  • 1Department of Chemistry, Cornell University, Ithaca, New York 14853, United States.

The journal of physical chemistry. A
|July 8, 2024
PubMed
概括

本研究引入了一种新的计算方法,用于模拟多层系统中的反应速率. 扭曲平均场环聚合物 (kMF-RP) 方法准确地预测了反应动态.

科学领域:

  • 计算化学计算化学
  • 化学动力学 化学动力学
  • 理论化学 理论化学

背景情况:

  • 平均场环聚合物分子动力学 (MF-RPMD) 在模拟反应速率方面具有计算效率.
  • 准确的模拟非adiabatic状态对状态反应需要在划分表面的特定轨迹配置.

研究的目的:

  • 开发一种更准确,更有效的方法来计算多层系统中的反应速率.
  • 将扭曲环聚合物配置的必要性纳入平均场速率理论.

主要方法:

  • 引入一个人口差异坐标.
  • 修改了反应性流量表达式,只包括扭曲的配置.
  • 在线性振动合模型上测试kMF-RP方法.

主要成果:

  • 新的kMF-RP利率方法是有效的实施.
  • 该方法在各种模型中证明了定量准确性.
  • 在广泛的驱动力,合强度和温度范围内保持精度.

结论:

  • kMF-RP方法提供了一种高效准确的方法来模拟复杂系统中的反应速率.
  • 这种方法成功地整合了对非adiabatic动态的扭曲配置的重要性.

更多相关视频

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

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Last Updated: Jun 21, 2025

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

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  • 该方法在各种化学和物理条件下得到验证.