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Updated: Jul 12, 2026

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
08:40

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules

Published on: April 28, 2014

Cu (II) のポリプロピレンイン) デンドリマー複合体から派生したCu (II) ナノクラスター

P N Floriano1, C O Noble, J M Schoonmaker

  • 1Choppin Laboratories of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803-1804, USA.

Journal of the American Chemical Society
|October 25, 2001
PubMed
まとめ

研究者らは,EXAFSとXANESを用いて銅 (II) 複合体とポリ (II) プロピレン (II) dendrimersを特徴付けました. 還元により銅 (((0) のナノクラスターが生み出され,その大きさはデンドリマー生成の増加とともに体系的に減少した.

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Anionic Chain-Growth Polymerization: Overview01:20

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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,...
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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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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,...