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相关概念视频

Polymers02:34

Polymers

34.3K
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...
34.3K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.6K
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...
2.6K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.2K
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.
3.2K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.6K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
7.6K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.0K
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,...
2.0K
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

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相关实验视频

Updated: May 21, 2025

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering
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Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering

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聚合物和光:一个爱恨的关系.

M A Sachini N Weerasinghe1, Tochukwu Nwoko1, Dominik Konkolewicz1

  • 1Department of Chemistry and Biochemistry, Miami University 651 E High St Oxford OH 45056 USA d.konkolewicz@miamioh.edu.

Chemical science
|March 19, 2025
PubMed
概括

聚合物以有益和有害的方式与光相互作用. 了解这些"爱"和"恨"的关系是开发新材料和解决现有的聚合物挑战的关键.

科学领域:

  • 聚合物科学 聚合物科学
  • 摄影化学的使用.
  • 材料科学 材料科学 材料科学

背景情况:

  • 聚合物和光之间的相互作用是一个快速增长的领域.
  • 这些相互作用可以是建设性的或破坏性的,影响材料的特性和应用.

研究的目的:

  • 提供对聚合物-光相互作用的双重性质的全面概述.
  • 突出这些关系的有益 (摄影爱好) 和有害 (摄影恐惧) 方面.
  • 为未来的聚合物科学和材料工程的研究和应用提供信息.

主要方法:

  • 这种观点综合了现有的聚合物-光相互作用研究.
  • 它将现象分为光友和光恐的相互作用.
  • 对每个类别的关键示例和应用进行了讨论.

主要成果:

  • 光友互动使得光聚合,可控药物输送和废物管理等应用成为可能.
  • 光恐惧相互作用导致诸如光降解,变色和材料功能丧失等问题.
  • 了解这些对立的效应对于材料设计和性能优化至关重要.

结论:

  • 利用光友互动可以导致基于高分子的先进系统.

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Optical Control of Living Cells Electrical Activity by Conjugated Polymers
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Optical Control of Living Cells Electrical Activity by Conjugated Polymers

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相关实验视频

Last Updated: May 21, 2025

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering
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Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering

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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst

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Optical Control of Living Cells Electrical Activity by Conjugated Polymers
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  • 减轻光恐效应对于提高聚合物耐用性和寿命至关重要.
  • 对两种聚合物-光相互作用的平衡理解对于材料科学的创新至关重要.