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相关概念视频

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
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
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.7K
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...
2.7K

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相关实验视频

Updated: Jun 24, 2025

Characteristics of Precipitation-formed Polyethylene Glycol Microgels Are Controlled by Molecular Weight of Reactants
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Characteristics of Precipitation-formed Polyethylene Glycol Microgels Are Controlled by Molecular Weight of Reactants

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使用不同的粗粒度方法对聚乙烯氧化物 (PEO) 的比较研究.

Sanjeet Kumar Singh1, Diego Pantano1, Arnaud Prebe1

  • 1Department of Chemistry, Université de Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada.

The Journal of chemical physics
|June 13, 2024
PubMed
概括

通过对聚乙烯氧化物 (PEO) 的模拟方法进行比较,SPICA力场最好地复制了原子结构和动态特性,这对于电池材料开发至关重要.

科学领域:

  • 材料科学 材料科学 材料科学
  • 计算化学的计算化学
  • 聚合物科学 聚合物科学

背景情况:

  • 聚乙烯氧化物 (PEO) 由于其可加工性和离子导电性,对电池应用至关重要.
  • 了解不同模拟尺度的PEO属性是提高其性能的关键.

研究的目的:

  • 为了比较分析PEO的分子结构,热力学和动力学.
  • 评估三种粗粒度 (CG) 模拟方法与全原子 (AA) 模拟的准确性.

主要方法:

  • 利用了三种CG力场:MARTINI,SPICA和一个IBI衍生潜力.
  • 使用pcff+力场进行全原子 (AA) 模拟.
  • 根据文献数据验证模拟密度和可溶性参数.

主要成果:

  • 所有的模拟都显示了与文献的良好密度对齐;AA模拟准确地预测了可溶性参数.
  • 在复制PEO的分子间结构 (RDF),旋转半径 (Rg) 和端到端距离 (Re) 方面,SPICA力场表现出卓越的准确性.
  • IBI显示了中度的结构准确性,而MARTINI在表示结构性质方面存在局限性;SPICA也产生了增强的动态性.

结论:

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  • 斯皮卡力场成为模拟PEO结构和动态特性最可靠的CG方法.
  • 这项研究为选择适当的模拟技术提供了宝贵的见解,以优化基于PEO的电池材料.