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相关概念视频

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...
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.1K
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...
2.1K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.6K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.6K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

1.9K
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
1.9K
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

2.4K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
2.4K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

1.9K
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...
1.9K

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Updated: Jul 12, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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表面链-转移环-开放元解聚合聚合.

Xinting Wu1, Ning Ren1, Gangsheng Tong1,2

  • 1School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.

Langmuir : the ACS journal of surfaces and colloids
|October 30, 2023
PubMed
概括
此摘要是机器生成的。

表面链传输ROMP (SC-ROMP) 提供了一种更简单的方法来修改表面. 这种方法在一个步骤中使用环开放元解聚合和链转移来移植聚合物,避免催化剂移植.

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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions
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Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions

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Last Updated: Jul 12, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions
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科学领域:

  • 聚合物化学 聚合物化学
  • 材料科学 材料科学 材料科学
  • 表面科学是一门学科.

背景情况:

  • 环开元化聚合 (ROMP) 是一种多功能技术,用于将聚合物链接接入表面.
  • 表面启动的ROMP (SI-ROMP) 对于表面修饰是有效的,但涉及多个步骤,包括移植烯酸基质和转化催化剂.

研究的目的:

  • 使用ROMP开发一种更有效,更简单的表面修饰方法.
  • 引入表面链传输ROMP (SC-ROMP) 作为SI-ROMP的替代方案.

主要方法:

  • 提出了一种新的表面修饰方法,利用连锁转移反应与ROMP结合.
  • 在没有移植前转化催化剂的情况下将终端烯酸植入表面.
  • 通过ROMP和交叉转化实现了聚合物的同时聚合和接种,并通过ROMP和交叉转化实现了聚合物与烯酸骨干的接种.

主要成果:

  • 在各种表面上展示了SC-ROMP方法,包括碳纳米管,碳纤维,石墨烯纳米板和微球.
  • 在单个步骤中成功将聚合物链接接入表面.
  • 消除了对催化剂接种和从表面生长聚合物链的需求,与SI-ROMP相比,简化了该过程.

结论:

  • SC-ROMP提供了一个方便和有效的单步解决方案,用于通过ROMP进行表面修改.
  • 这种方法通过避免催化剂固定和复杂的多步骤程序来简化表面功能化.
  • 在各种纳米材料和微粒子中显示了SC-ROMP的多功能性.