ラジカル・スティッチング・ポリメリゼーションとその交代共ポリメリゼーション
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PubMedで要約を見る
まとめ
この要約は機械生成です。研究者らは,飽和した融合型バイサイクル単位で新しいポリケトンを生成するための新しいラジカルシューティングポリメリゼーション方法を開発しました. これらの高度なポリマーには 優れた熱安定性と透明性があります
科学分野
- ポリマー化学
- 材料科学
背景
- 飽和型溶融ポリマーはあまり研究されていない.
- 剛性,化学耐性,透明性,熱安定性による潜在的な用途.
研究 の 目的
- ポリケトンを飽和した溶融バイサイクルの重複単位で合成する.
- 新しいポリマーアーキテクチャのためのラジカル・シッティング・ポリメリゼーションを研究する.
主な方法
- スチリルビニルケトンの根性縫合ポリメリゼーション
- フリーラジカル条件下でのチェーン成長ポリメリゼーション
- 1-ステリル-2-ビニルベンゼンと交互に共聚する.
主要な成果
- ポリケトンの合成が成功し 縫合効率も高い
- 異なる2つのモノメアの最初の交互の縫合コポリメリゼーションを実証した.
- 得られたポリマーは有望な熱特性と高い透明性を表しています.
結論
- ラジカル・シッティング・ポリメリゼーションは,新しいポリケトン合成の効果的な方法である.
- 開発された方法は,熱安定性や透明性などの望ましい性質を持つポリマーの作成を可能にします.
関連する概念動画
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...
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...
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.
Alkenes undergo polymerization via a free-radical mechanism involving three steps: initiation, propagation, and termination.
Radicals are...
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...
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...
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...