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関連する概念動画

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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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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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
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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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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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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正確な非均衡型ポリプロピレングリコールポリロタキサン

James S W Seale1, Bo Song1, Yunyan Qiu1

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States.

Journal of the American Chemical Society
|September 8, 2022
PubMed
まとめ

分子ポンプは,固有の親和性のないポリマーチェーンにリングを閉じ込めることで,非均衡ポリロタキサンを生成します. 新しい素材の特性や応用が 可能になるのです

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Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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科学分野:

  • 超分子化学
  • ポリマー科学
  • 材料科学

背景:

  • 従来のポリロタキサン合成には,特定のリングポリマーの親和性が求められ,材料の設計が制限されます.
  • 非均衡のポリロタキサンは,親和性が欠如した捕らえたリングで,ユニークな性質を提供します.
  • 分子ポンプは 合成の限界を克服する 新しい戦略を提供します

研究 の 目的:

  • 分子ポンプと電気合成を用いて非均衡ポリロタキサンを合成する.
  • サイクロビス (((パラクアット-p-フェニレン) リングをポリプロピレングリコール (PPG) チェーンにスレッド化することを調査する.
  • 溶解性と熱安定性を含む合成されたポリロタキサンの性質を特徴づける.

主な方法:

  • ポンプカセットをポリプロピレングリコール (PPG) チェーンに,銅で触媒化されたアジドアルキンサイクル添加物で結合する.
  • PPGベースのポリロタキサンを合成するための1ポット電気合成プロトコル.
  • ポリロタキサン溶解性,水力ダイナミック直径,および拡散定数の特徴.
  • 熱分解とリング脱線の調査

主要な成果:

  • PPGベースのポリロタキサンを10個までのサイクロビス ((パラクアット-p-フェニレン) リングで成功して合成する.
  • 防水性PPGポリマーは2つのリングをスレッドしただけで水溶性になります.
  • 水力学的性質は,スレッドリングの数によって変化した.
  • 不均衡のポリロタキサンは,上昇した温度で漸進的な分解とリングの脱線を示した.

結論:

  • 分子ポンプは,低親和系で非均衡ポリロタキサンの合成を効果的に可能にします.
  • スレッドリングの数は,ポリロタキサンの溶解性および物理特性に大きく影響する.
  • 合成されたポリロタキサンは,調整可能な特性とダイナミックな応用の可能性を示しています.