ポリサイクルエネモノメアの制御された生カスケードポリメリゼーション:ステレオ化学的および構造的調査のための完全な分解性を活用する
Antonio Rizzo1, Eunsong Jung1, Hojoon Song1
1Department of Chemistry, Seoul National University, Seoul08826, Republic of Korea.
Journal of the American Chemical Society
|August 12, 2022
まとめ
コントロールされたカスケードポリメリゼーションの設計は困難です. この研究では,ポリサイクルエニンモノメアのメタテシスポリメリゼーションを使用して,制御された生体ポリメリゼーションとブロックコポリマー合成を可能にする高カスケード効率 (> 99%) を達成しました.
科学分野:
- ポリマー化学
- 有機合成
背景:
- カスケードポリメリゼーションには,単体から重複単位への変換のための複数の結合変換が含まれます.
- 制御されたカスケードポリメリゼーションの設計は,効率に影響を与える潜在的な副作用のために複雑です.
研究 の 目的:
- ポリサイクリックエニンモノメールのメタテシスベースのカスケードポリメリゼーションを調査する.
- モノマー構造の変化がポリメリゼーション性能とカスケード効率にどのように影響するか調査する.
主な方法:
- 異なるステレオ化学,リンクナー,リング型を持つポリサイクルエニンモノマーの合成.
- ポリマーを形成するメタテシス・ポリメリゼーション
- カスケード効率を決定する酸触媒分解分析.
主要な成果:
- モノマー構造は,ポリメリゼーション性能とカスケード反応の完了に大きく影響する.
- 99%以上のカスケード効率で制御された生カスケードポリメリゼーションを達成しました.
- 様々なブロックコポリマーを成功裏に製造した.
結論:
- ポリサイクルエニンモノマーの構造的調節は,カスケードポリメリゼーションの成功の鍵です.
- メタテシスカスケードポリメリゼーションは,複雑なポリマー構造への制御された経路を提供します.
- 高カスケード効率は,ブロックコポリマーの正確な合成を可能にします.
関連する概念動画
02:35Free-Radical Chain Reaction and Polymerization of Alkenes
8.1K
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.
8.1K
00:53Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
2.0K
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...
2.0K
01:04Anionic Chain-Growth Polymerization: Mechanism
2.1K
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...
2.1K
01:17Ziegler–Natta Chain-Growth Polymerization: Overview
3.4K
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...
3.4K
01:03Step-Growth Polymerization: Overview
3.6K
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...
Many natural and synthetic polymers are produced by...
3.6K
00:57Cationic Chain-Growth Polymerization: Mechanism
2.4K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.4K