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関連する概念動画

Polymers02:34

Polymers

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 properties that they exhibit. Additionally,...
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Radical Chain-Growth Polymerization: Overview

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

Radical Chain-Growth Polymerization: Chain Branching

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

Anionic Chain-Growth Polymerization: Overview

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,...
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
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ポリフェニレンデンドロンサイドチェーンを持つポリフルオレン: 聚合しない,光を発するポリマーに向かって.

S Setayesh1, A C Grimsdale, T Weil

  • 1Contribution from the Max-Planck-Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany.

Journal of the American Chemical Society
|July 18, 2001
PubMed
まとめ

研究者らは,集積を防ぐために大容量のデンドリマー置換剤を使用して,新しい青色放射ポリマーを開発しました. この技術革新により,純粋な青光と低電圧の効率的な有機発光ダイオード (OLED) の放出が可能になる.

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科学分野:

  • マテリアルサイエンス 材料科学
  • ポリマー化学のポリマー化学について
  • オーガニック・エレクトロニクス

背景:

  • ポリフルオレンは,効率的な青色の放射性があるため,有機発光ダイオード (OLED) の有望な材料です.
  • ポリフルオレン鎖の集積は,望ましくない長波長放射とデバイスの性能の低下につながる可能性があります.
  • ポリマー形態の制御は,純粋な青色放射と安定したOLEDを実現するために不可欠です.

研究 の 目的:

  • 純粋な青色の放出のために,抑制された集積形成を持つ新しいポリフルオレン誘導体を合成する.
  • ポリフルオレン聚合物と放出特性に対する大型ポリフェニレンデンドリマー置換物の影響を調査する.
  • 有機発光ダイオード (OLED) 装置における新しいポリフルオレンの性能を評価するために.

主な方法:

  • 大型のポリフェニレンデンドリマー側鎖を組み込んだ新しいポリフッロレン (PF) デリバティブの合成.
  • 光学特性を分析するために吸収光学と放射光学を用いた特徴付け.
  • ポリマーの骨格にデンドリマー置換物の構成的影響を評価するための分子モデリング.
  • 合成されたポリマーを用いた有機発光ダイオード (OLED) 装置の製造と試験.

主要な成果:

  • 合成されたポリフルオレン誘導体は,巨大なデンドリマー置換物による長波長放出集積物の抑制に起因する純粋な青色の放射を示した.
  • 顕微鏡および計算分析により,デンドリマー側鎖はポリフッ素の骨格に重大なトルションを誘導しないことが確認されました.
  • 異なる9,9-ディアリル置換物を持つ新しいポリフルオレンは,効果的な集積抑制のために必要な最小の置換物サイズを特定するために準備されました.
  • 新しいポリフルオレンで製造された有機発光ダイオード (OLED) は,開始電圧が4V未満で効率的な青光放射を証明しました.

結論:

  • 大容量のポリフェニレンデンドリマー置換剤は,ポリフッ素の集積を防止し,純粋な青色の放出につながるのに有効です.
  • ポリフルオレンの分子設計は,特定の光学特性を達成し,望ましくない集積物の形成を抑制するために調整することができます.
  • 開発されたポリフルオレン材料は,高性能で低電圧の青色有機発光ダイオード (OLED) に応用する大きな可能性を示しています.