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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)

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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

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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
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

9.3K
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.
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.2K
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...
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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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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...
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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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...
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相关实验视频

Updated: Jan 8, 2026

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

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工程免费体积在正面环开放转化聚合物通过悬挂塑化.

Kevin A Stewart1, Francesca J Lombardi1, Sky D Cao1

  • 1Department of Chemistry, University of Utah, Salt Lake City, Utah, USA.

Advanced materials (Deerfield Beach, Fla.)
|December 23, 2025
PubMed
概括

这项研究引入了侧链塑化,用于前环开放元解聚合 (FROMP),使可调节的弹性体材料成为可能. 通过结合基组,研究人员实现了显著的属性修改,扩大了FROMP应用.

关键词:
纠纠的纠是一个问题.额头聚合的聚合物.前环-开放的元聚合聚合聚合聚合.材料制造业的制造业的材料制造业反应制造 反应制造 反应制造

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A Simple and Efficient Protocol for the Catalytic Insertion Polymerization of Functional Norbornenes
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A Simple and Efficient Protocol for the Catalytic Insertion Polymerization of Functional Norbornenes

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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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A Simple and Efficient Protocol for the Catalytic Insertion Polymerization of Functional Norbornenes
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A Simple and Efficient Protocol for the Catalytic Insertion Polymerization of Functional Norbornenes

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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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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
  • 有机合成 有机合成

背景情况:

  • 前环开放元解聚合 (FROMP) 提供了高效的聚合物合成,但受到刚性脊柱的限制.
  • 现有的FROMP材料缺乏可调节的特性,限制了它们的应用范围.

研究的目的:

  • 开发FROMP的侧链塑化策略,以扩大可访问的材料特性.
  • 研究不同基链长度对聚合物网络特征和性能的影响.

主要方法:

  • 使用二cyclopentadiene (DCPD) 或化DCPD (DCPD-H2) 与不同n-基侧链 (n=8,12,16) 的norbornene的联合聚合.
  • 材料属性的表征,包括玻璃过渡温度 (Tg),模块和破裂时的延伸.
  • 使用动态机械分析 (DMA) 和溶剂膨胀比率的自由体积分析.

主要成果:

  • 纳入n-基侧链可预见地降低了Tg和modules,将材料从刚性热聚材料转换为长度>800%的弹性体.
  • 吊的长度和分布被确定为控制网络孔隙性和移动性的关键因素.
  • 高基含量配方表现出非线性前部传播 (旋转模式) 和应变诱导的美白.

结论:

  • 侧链工程是一种多功能策略,可以将FROMP扩展到弹性体系统中.
  • 这种方法为软,可调和和结构可编程材料提供了可扩展的途径.
  • 这些发现为先进的聚合物系统的空间模式和分子对齐提供了机会.