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関連する概念動画

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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...
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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...
2.0K
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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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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精密カルボキシル酸機能化されたポリエステル

Matilde Concilio1, Gregory S Sulley1, Fernando Vidal1

  • 1Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.

Journal of the American Chemical Society
|February 14, 2025
PubMed
まとめ

研究者はリング開き共ポリメリゼーションを使用して再処理可能な熱固体のようなポリマーを開発しました. これらの新しい材料は優れた機械的性質と高いクリープ回復力を発揮し,従来の熱固体制約を克服しています.

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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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科学分野:

  • ポリマー化学
  • 材料科学

背景:

  • サーモセットは優れた安定性を提供しますが,永久的なクロスリンクのために再処理性は欠いています.
  • 再利用可能な熱固体代替品の開発は 持続可能性にとって極めて重要です

研究 の 目的:

  • 熱固体のような性質を持つ再処理可能なポリマーネットワークを合成する.
  • ネットワーク特性に対する触媒組成の影響を調査する.

主な方法:

  • 環開き共ポリメリゼーション (ROCOP) で合成された低分子量ポリエステル.
  • ビスフェノールAのディグリシジルエーテルをクロスリンクとして使用してポリマーネットワークを形成した.
  • 固化とダイナミック・ボンド交換を制御するために,触媒混合物 (亜鉛ビス (((2-エチルヘキサノアート) と1,8-ディアザビサイクロ (((5.4.0) アンデック-7-エネ) を使用した.

主要な成果:

  • 調節可能な機械的特性 (断裂時の延長 90%450%,UTS 0.3024 MPa) を達成した.
  • クリープ回復率が高いことが証明された (> 5サイクル後に90%).
  • 合成されたポリマーネットワークの良好な再処理性が確認された.

結論:

  • ROCOPのアプローチは,再処理可能な熱固体ネットワークのための機能的なポリエステルの作成を可能にします.
  • 触媒のチューニングは,機械的な性能と動的行動を制御する方法を提供します.
  • この研究は,持続可能な耐熱材料の設計のための実行可能な戦略を提示しています.