Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.4K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.4K
Polymers02:34

Polymers

21.0K
21.0K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.8K
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...
2.8K
Catenins01:23

Catenins

2.3K
Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the...
2.3K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.3K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
2.3K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.1K
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,...
2.1K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Control of Dynamic Composites through Filler Surface Chemistry.

ACS macro letters·2026
Same author

Stuck on Repeat: Dynamic Liquid Crystal Elastomers as (Re)trainable Adhesives.

ACS applied materials & interfaces·2026
Same author

Depolymerization as a Design Strategy: Depolymerization Etching of Polymerization-Induced Microphase Separations.

ACS central science·2025
Same author

Impact of dynamic bond strength on the training of liquid crystal elastomers.

Chemical science·2025
Same author

Manipulating dynamic covalent bonds through direct photoisomerization.

Chemical science·2025
Same author

Multipotent Elastomers via Tempering of Phase-Separated Dynamic Covalent Networks.

ACS macro letters·2025
Same journal

Linker Engineering toward NIR-II Metal-Organic Framework with Maximal Emission beyond 1000 nm for Inflammatory Bowel Disease Imaging.

Journal of the American Chemical Society·2026
Same journal

Observing Kinetic Selectivity in Anthracene Photodimerization through Selective Quenching by Excited States of Proximate Rare Earth Cations.

Journal of the American Chemical Society·2026
Same journal

Sequence-Dependent Folding of Recognition-Encoded Melamine Oligomers.

Journal of the American Chemical Society·2026
Same journal

Large Thermo- and Mechanosalient Actuation via Cooperative Twist Elasticity-Induced Packing Motif Conversion.

Journal of the American Chemical Society·2026
Same journal

Discovery and Biosynthesis of Lanthipeptides Featuring an Azepinoindole Scaffold by Radical <i>S</i>-Adenosylmethionine Enzyme-Catalyzed C-C Bond Formation.

Journal of the American Chemical Society·2026
Same journal

Enantiopurity-Controlled Magnetism in a Two-Dimensional Organic-Inorganic Material.

Journal of the American Chemical Society·2026
查看所有相关文章

相关实验视频

Updated: Jul 29, 2025

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

7.9K

双线式滑环聚链网

Laura F Hart1, William R Lenart1, Jerald E Hertzog1,2

  • 1Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States.

Journal of the American Chemical Society
|May 25, 2023
PubMed
概括
此摘要是机器生成的。

具有移动交叉连接的机械互锁聚合物,如滑环聚链网,提供增强的性. 从这些网络中去除金属离子释放了链的流动性,并改善了弹性排水.

更多相关视频

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

3.4K
Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

7.9K

相关实验视频

Last Updated: Jul 29, 2025

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

7.9K
Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

3.4K
Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

7.9K

科学领域:

  • 聚合物化学
  • 材料科学
  • 超分子化学

背景情况:

  • 聚合物网络中的共价交联通常会导致由于结构不均而导致的脆弱性.
  • 机械互锁聚合物 (MIP) 与移动交叉连接,如滑环网络 (SRN) 和多链网 (PCN),提供了更好的性和强度.
  • 滑环多链网 (SR-PCN) 结合了SRN和PCN的特征,使其能够通过滑链环进行动态交叉连接.

研究的目的:

  • 通过金属离子模板伪[3]rotaxane (P3R) 交叉连接器合成和研究滑环聚链网 (SR-PCN).
  • 探索P3R与共价交叉连接器的比率变化的网络性能影响.
  • 了解金属离子在控制交叉链的移动性及其对机械行为的影响.

主要方法:

  • 使用无催化剂的氧化物/环添加聚合物合成SR-PCN.
  • 将金属离子模拟的双线假[3]rotaxane (P3R) 作为移动交叉连接器与共价交叉连接器相结合.
  • 合成的SR-PCN的机械性能测试,包括金属离子去除前后的研究.

主要成果:

  • 金属离子有效地"锁定"伪[3]rotaxane环,导致与常规共价聚乙醇 (PEG) 凝相似的机械性能.
  • 移除金属离子释放了连锁环的移动性,导致高频机械转换.
  • 在没有金属离子的SR-PCN中,动态交联增强了聚合物链的松,并在较长的时间范围内加快了弹性排水.

结论:

  • SR-PCN提供了一个可调节的平台,用于创建强大和动态的聚合物网络.
  • 金属离子模板提供了一种可逆的方法来控制交叉连接的移动性和材料特性.
  • 解锁的SR-PCN的动态性导致了更好的机械响应和流体传输特性.