サイドチェーンコバルトセニウムを含むブロック共ポリマーの合成と溶液の自己組み立て
Lixia Ren1, Christopher G Hardy, Chuanbing Tang
1Department of Chemistry and Biochemistry and Nanocenter, University of South Carolina, 631 Sumter Street, Columbia, South Carolina 29208, USA.
Journal of the American Chemical Society
|June 15, 2010
まとめ
研究者はコバルトセニウムブロックコポリマーを合成し,その自己組み立てを研究した. これらのポリマーは,異なる溶媒混合物の中で,異なるベシクルおよびミセル/ナノチューブ構造を形成し,制御された形態論を示した.
科学分野:
- ポリマー化学のポリマー化学について
- マテリアルサイエンス 材料科学
- ナノテクノロジー ナノテクノロジー
背景:
- ブロックコポリマーは,調節性特性を有する多用途のマクロ分子です.
- コバルトセニウム化合物は,ユニークな電気化学的および構造的特性を有しています.
- 自己組み立ての理解は,高度な材料の設計に不可欠です.
研究 の 目的:
- 新しいサイドチェーンコバルトセニウムを含むブロックコポリマーを合成するために.
- これらのコポリマーの溶液の自己組み立て行動を調査するために.
- 結果となるナノ構造物に対する溶媒環境の影響を調査する.
主な方法:
- 高純度のモノカルボキシコバルトセニウム製剤.
- コバルトセニウムをポリ・テート・ブチル・アクリラート・ブロック・ポリ・2-ヒドロキシエチル・アクリラートに挿入する.
- 溶液ベースの技術を用いた自己組み立て形態の特徴化.
主要な成果:
- 成功して合成されたポリ・テート・ブチル・アクリラート・ブロック・ポリ・2-アクリロイロキシエチル・コバルトセニウム・カルボキシラート).
- アセトン/水混合物での水泡形成が観察されました.
- アセトン/クロロフォーム混合物におけるミセルとナノチューブ形成が確認された.
結論:
- コバルトセニウムブロックコポリマーは,制御されたサイドチェーン機能化で合成することができます.
- 溶媒の極性性は,自己組み立て経路とその結果ナノ構造に大きく影響します.
- これらの発見は,薬物投与やナノテクノロジーなどの分野での応用の可能性を広げています.
関連する概念動画
Characteristics and Nomenclature of Copolymers
Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
Cationic Chain-Growth Polymerization: Mechanism
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 generated carbocation,...
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.
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,...
Structural Isomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Ziegler–Natta Chain-Growth Polymerization: Overview
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 catalyst, high molecular...


