塩素で覆われたポリ (メチルメタクリlate) のターミナル選択的トランステリフィケーション:テレケリックおよびピンポイント機能化されたポリマーのモジュールアプローチ
Yusuke Ogura1, Takaya Terashima1, Mitsuo Sawamoto1
1Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University , Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
Journal of the American Chemical Society
|April 5, 2016
まとめ
この研究は,ポリマーを改造し,正確な機能群を持つ特殊な材料を作成するための新しい方法を導入します. この技術により,様々な用途のための高度なポリマーが開発できます.
科学分野:
- ポリマー化学
- 有機合成
背景:
- 通常のポリマー改造方法には 精度が欠けています
- ポリマー機能化のための制御された方法の開発は,先進的な材料にとって極めて重要です.
研究 の 目的:
- テレケリックおよびピンポイント機能化されたポリマーを作成するためのモジュラーアプローチを開発する.
- 塩素で覆われたポリ・メチル・メタクリlate (PMMA-Cl) の末端選択的トランスエステル化を達成するために.
主な方法:
- アルコールとアルコ酸化チタンの触媒を用いたPMMA-Clのターミナル選択型変エステル化.
- 生きた根のポリメリゼーションにおけるマクロイニシアターとして,結果として得られた塩素で覆われたテレケリックポリマーを使用する.
- 精密機能化のためのポリメリゼーションとトランスエステル化の繰り返し適用.
主要な成果:
- PMMA-Clのαとω端の両方で効率的かつ選択的なトランスエステル化を行い,塩素で覆われたテレケリックポリマーを生成します.
- 得られたテレケリックポリマーは,末端の塩素原子を保持し,さらなるポリメリゼーションを可能にします.
- 正確に配置された機能的モノマーユニットを持つユニークなピント機能化されたポリマーの成功合成.
結論:
- ターミナル選択型トランスエステル化は,カスタマイズされたポリマーアーキテクチャへの汎用的な経路を提供します.
- この方法により,ポリマーの構造と機能を正確に制御できます.
- 開発された技術は,特定の性質を持つ高度なポリマーを作成するのに価値があります.
関連する概念動画
Polymer Classification: Stereospecificity
3.4K
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...
3.4K
Olefin Metathesis Polymerization: Overview
2.7K
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...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
2.7K
Types of Step-Growth Polymers: Polyesters
2.6K
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 polymer...
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 polymer...
2.6K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
2.3K
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...
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...
2.3K
Anionic Chain-Growth Polymerization: Overview
2.8K
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,...
2.8K
Radical Chain-Growth Polymerization: Mechanism
3.8K
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 species into...
3.8K


