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: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.0K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.0K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.2K
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...
2.2K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

8.0K
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.
8.0K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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

2.6K
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...
2.6K
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
Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

2.3K
Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
2.3K

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

Overnight sleep features and next-morning brain metabolism in older adults.

Sleep medicine·2026
Same author

SERPINE2-mediated activation of JAK2/STAT3 facilitates NRF2 nuclear translocation and GCLC transcription to confer ferroptosis resistance and lenvatinib resistance in hepatocellular carcinoma.

Journal of experimental & clinical cancer research : CR·2026
Same author

Overactive Bladder and Suicidal Ideation: A National Cross-Sectional Study Identifying Depression as the Primary Mediator.

Neurourology and urodynamics·2026
Same author

Tumor microenvironment-driven mechanisms of photodynamic therapy resistance and emerging targeted combination strategies.

Journal of photochemistry and photobiology. B, Biology·2026
Same author

Identification of a Prognostic Gene Signature Based on Lenvatinib Resistance in Hepatocellular Carcinoma with Functional Validation of the Key Gene CPB2.

Journal of hepatocellular carcinoma·2026
Same author

Clinician engagement shapes the impact of AI-based ECG screening for chronic liver disease in primary care.

NPJ digital medicine·2026
Same journal

Harnessing Naphthalimide Scaffolds for Sustainable CO<sub>2</sub> Utilization: A Metal-, Halide-, and Solvent-Free Photocatalytic CO<sub>2</sub> Cycloaddition via Sequential Two-Photon Activation.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same journal

Protein-Independent Liquid-Liquid Phase Separation of Adenosine Triphosphate Under Crowded Conditions.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same journal

A Unified Approach for the Synthesis of Conformationally Locked and sp<sup>2</sup>-sp<sup>3</sup> Fused Hybrids.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same journal

Decoding Heptazine Architectures: From Molecular Association to Structural Insight.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same journal

An Electrophilic Uridine Building Block for Post-Synthetic RNA Modification as Exemplified for Spin Labeling.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same journal

Recent Advances in Pd-Catalyzed Directed meta-C-H Olefination: Strategies and Outlook.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
查看所有相关文章

相关实验视频

Updated: Jul 26, 2025

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
07:28

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Published on: November 27, 2015

13.3K

用共价有机框架支持的金属用于乙烯聚合.

Bangban Zhu1, Kan Liu1, Liqiong Luo2

  • 1State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering Zhejiang University, Hangzhou, 310027, P. R. China.

Chemistry (Weinheim an der Bergstrasse, Germany)
|June 21, 2023
PubMed
概括
此摘要是机器生成的。

共价有机框架 (COF) 材料有效地支持金属催化剂的烯聚合. 这种由COF支持的催化剂显著增加了活性,并增强了聚乙烯的特性,包括分子量和强度.

关键词:
共价有机框架是共价有机框架.乙烯聚合乙烯的聚合.不同质的聚合聚合.聚烯是一种多烯.支持金属的金属.

更多相关视频

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
09:37

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

9.7K
Author Spotlight: Exploring Self-Assembled MOF-Polymer Composites
06:48

Author Spotlight: Exploring Self-Assembled MOF-Polymer Composites

Published on: June 14, 2024

1.8K

相关实验视频

Last Updated: Jul 26, 2025

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
07:28

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Published on: November 27, 2015

13.3K
Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
09:37

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

9.7K
Author Spotlight: Exploring Self-Assembled MOF-Polymer Composites
06:48

Author Spotlight: Exploring Self-Assembled MOF-Polymer Composites

Published on: June 14, 2024

1.8K

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
  • 催化剂是一种催化剂.

背景情况:

  • 支持的催化剂提高了烯聚合性能.
  • 开发具有可控结构和兼容性的支持催化剂对于高活性和产品质量至关重要.

研究的目的:

  • 研究共价有机框架 (COF) 材料在乙烯聚合过程中作为金属催化剂的载体的使用.
  • 用COF支持的催化剂评估生成的聚乙烯 (PE) 的催化活性和特性.

主要方法:

  • 合成的COF材料作为金属催化剂Cp2ZrCl2.2.的载体.
  • 使用同质和COF支持的催化剂进行乙烯聚合.
  • 分析了产生的聚乙烯的催化活性,分子量,分子量分布,点,微观结构,抗拉强度和破裂时的延长.

主要成果:

  • 与同质催化剂 (11.2×10^6 g·mol−1·h−1) 相比,COF支持的催化剂表现出明显更高的活性 (31.1×10^6 g·mol−1·h−1).
  • 用COF支持的催化剂生产的聚乙烯显示重量平均分子量增加 (160到308kDa) 和分子量分布较窄 (3.3到2.2).
  • 观察到增强的机械性能,包括增加拉伸强度 (19.0到30.7MPa) 和破裂时的延伸 (350到1400%).

结论:

  • 氧化材料是烯聚合物聚合过程中金属催化剂的有效载体.
  • COF支持增强了催化活性并改善了聚乙烯的特性,从而产生了高性能聚烯烯.
  • 这种方法为开发先进的支持催化剂和功能性多聚烯提供了一个有前途的途径.