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相关概念视频

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.8K
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...
2.8K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.4K
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...
2.4K
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
Polymers: Defining Molecular Weight01:01

Polymers: Defining Molecular Weight

2.8K
Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight.  So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
The number average molecular weight (Mn) is the summation of the number...
2.8K
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

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相关实验视频

Updated: Jun 23, 2025

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Published on: January 19, 2016

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预测兼容聚合物混合物的性.

Robert J S Ivancic1, Debra J Audus1

  • 1Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.

Science advances
|June 19, 2024
PubMed
概括
此摘要是机器生成的。

这项研究介绍了一种预测模型,用于使用兼容剂固聚合物混合物. 该模型揭示了分子桥梁如何提高混合性,有助于设计先进材料.

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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

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Disentangling High Strength Copolymer Aramid Fibers to Enable the Determination of Their Mechanical Properties
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Disentangling High Strength Copolymer Aramid Fibers to Enable the Determination of Their Mechanical Properties

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相关实验视频

Last Updated: Jun 23, 2025

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
11:17

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

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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

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Disentangling High Strength Copolymer Aramid Fibers to Enable the Determination of Their Mechanical Properties
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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 计算材料科学科学 计算材料科学

背景情况:

  • 聚合物混合物提供了增强的材料性能,但往往遭受相位分离和脆性.
  • 兼容器可以提高混合性,但其复杂的设计空间阻碍了优化.

研究的目的:

  • 开发一个可预测的模型,用于相容玻璃聚合物混合物的性.
  • 阐明兼容剂增强混合性的机制.

主要方法:

  • 开发一个理论模型来预测混合性.
  • 通过广泛的分子动力学模拟进行验证.
  • 使用自相一致的场理论进行参数化.

主要成果:

  • 该模型表明,兼容剂通过在接口上形成分子桥梁来加固混合物.
  • 模拟证实了模型在各种参数上的预测,例如聚合物不兼容性和兼容器结构.
  • 模型预测与实验数据保持一致,表明其实际适用性.

结论:

  • 开发的理论为优化玻璃聚合物混合物的兼容剂设计提供了一个框架.
  • 这种in silico方法为创建下一代聚合物混合物提供了微观见解.
  • 该研究促进了用于工业应用的硬化聚合物混合物的高效开发.