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関連する概念動画

Anionic Chain-Growth Polymerization: Mechanism01:04

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.
Mechanism of Lamellipodia Formation01:31

Mechanism of Lamellipodia Formation

Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
Anionic Chain-Growth Polymerization: Overview01:20

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,...
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...

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関連する実験動画

Updated: Jul 5, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

自己組織化可能なデンドロニズされた螺旋状ポリフェニルアセチレンからナノメカニカル機能.

Virgil Percec1, Jonathan G Rudick, Mihai Peterca

  • 1Roy & Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.

Journal of the American Chemical Society
|May 21, 2008
PubMed
まとめ

自己組織化ヘリカルポリマーは,分子ナノマシンとして機能します. これらの高度な材料は,機械的な作業を行うことができ,ナノスケールアクチュエーションとマクロスケールアプリケーションの可能性を実証しています.

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
11:42

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
08:40

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules

Published on: April 28, 2014

関連する実験動画

Last Updated: Jul 5, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
11:42

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
08:40

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules

Published on: April 28, 2014

科学分野:

  • ポリマーサイエンスの科学
  • 材料科学 材料科学とは
  • ナノテクノロジー ナノテクノロジー ナノテクノロジー

背景:

  • デンドロニズドヘリクアルポリマーは,分子機械のためのユニークなアーキテクチャを提供します.
  • 自己組織化は,分子運動をマクロスコーピック効果に変換する鍵です.

研究 の 目的:

  • 自己組織化された螺旋型デンドロン化シストランソイドポリフェニルアセチレン (cis-PPAs) のナモメカニカル機能を実証する.
  • ナノメカニカルアクチュエーションのための重要な超分子構造特性を特定する.

主な方法:

  • cis-PPAライブラリの合成と特徴付け.
  • 段階移行 (六角柱状の格子から液晶相への移行) の調査.
  • 繊維挤出と作業の移動能力の評価.

主要な成果:

  • cis-PPAは,ナモメカニカル機能を可能にする第1次相移行を示します.
  • シス-PPAの挤出繊維は,その質量の250倍もの物体を移動させることができます.
  • シソイドからトランソイドのイソメリゼーションによる可逆的な脊髄拡張/収縮が観察されました.

結論:

  • セルフオーガナイズ可能なデンドロナイズドヘリカルポリマーは,効果的な分子ナノマシンです.
  • ナノメカニカル機能は,特定の超分子構造と相変異と関連しています.
  • これらのポリマーは,マクロスコープのアプリケーションのアクチュエータとして有望を示しています.