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

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.5K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
2.5K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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

3.1K
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...
3.1K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.5K
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 polymer...
2.5K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

9.4K
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.
9.4K

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

Synthesis of Two-Dimensional Mechanically Interlocked Polymers at the Hundred-Gram Scale.

Journal of the American Chemical Society·2026
Same author

Comparative evaluation of PFAS-selective adsorbents in hard-to-treat residual waste streams.

Chemical engineering journal (Lausanne, Switzerland : 1996)·2026
Same author

Peptide-Functionalized Rosette Nanotubes: Programmable Supramolecular Assembly and Tunable Peptide Surface Organization.

Biomacromolecules·2026
Same author

Covalent Adaptable Networks: Reprocessable Cross-Linked Polymers.

Chemical reviews·2026
Same author

Electrochemical Degradation of Perfluoroalkyl Sulfonates via Sulfonate to Carboxylate Conversion.

Angewandte Chemie (International ed. in English)·2026
Same author

AIMNet2-NSE: A Transferable Reactive Neural Network Potential for Open-Shell Chemistry.

Angewandte Chemie (International ed. in English)·2025

相关实验视频

Updated: Jan 17, 2026

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

3.9K

使用其残留聚合催化剂再加工热聚氨泡

Subeen Kim1, Lillian M Felsenthal1, Oliver Sala2

  • 1Department of Chemistry, Northwestern University, 2045 Sheridan Road, Evanston, Illinois 60208, United States.

Journal of the American Chemical Society
|September 19, 2025
PubMed
概括

这项研究展示了一种利用残留催化剂回收热聚氨 (PU) 泡废弃物的新方法. 这种方法避免添加新的催化剂,降低了与PU再加工相关的成本和环境问题.

更多相关视频

Stabilizing Hepatocellular Phenotype Using Optimized Synthetic Surfaces
08:50

Stabilizing Hepatocellular Phenotype Using Optimized Synthetic Surfaces

Published on: September 26, 2014

10.6K
Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
10:22

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer

Published on: November 30, 2020

3.9K

相关实验视频

Last Updated: Jan 17, 2026

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

3.9K
Stabilizing Hepatocellular Phenotype Using Optimized Synthetic Surfaces
08:50

Stabilizing Hepatocellular Phenotype Using Optimized Synthetic Surfaces

Published on: September 26, 2014

10.6K
Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
10:22

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer

Published on: November 30, 2020

3.9K

科学领域:

  • 聚合物化学
  • 材料科学
  • 可持续的化学

背景情况:

  • 热聚氨 (PU) 泡回收通常需要添加新的催化剂,增加成本和潜在的环境危害.
  • 在合成过程中PU泡中存在的残留催化剂可能具有碳酸盐交换活性,使其能够在没有附加剂的情况下进行再加工.

研究的目的:

  • 调查使用剩余的三级胺催化剂的潜力,例如1,4-diazabicyclo[2.2.2]octane (DABCO),用于再处理热废物.
  • 在PU回收相关的各种条件下评估DABCO在碳酸盐交换反应中的催化活性.

主要方法:

  • 进行了模拟化合物研究和交叉实验,以评估DABCO在碳酸盐交换中的催化机制和活性.
  • 在双螺杆挤出机中进行了商业热性PU泡的再加工,检查了剪切力和残留催化剂的影响.
  • 再加工PU薄膜的特性包括热分析 (玻璃过渡温度) 和机械测试 (拉伸性质).

主要成果:

  • 证实DABCO能够催化分离性和关联性碳酸盐交换,其活性受酒精度的影响.
  • 与小分子研究相比,双螺杆挤出机中的微化合物由于高切削力而加速了键交换.
  • 三种商用耐热PU泡成功再加工成保持原始热和机械性能的薄膜,并生产了可调节的复合材料.

结论:

  • 像DABCO这样的剩余三级氨基催化剂可以有效地促进热固性PU废物的再加工,而不会改变商业配方.
  • 这种方法为PU泡回收提供了成本效益和环保的方法,保护了材料的性能.
  • 这些发现突出了通过利用固有的催化活性来实现PU产品可持续回收的潜力.