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Conformations of Cyclohexane02:11

Conformations of Cyclohexane

Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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 the...
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.
Cationic Chain-Growth Polymerization: Mechanism00:57

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,...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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...

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関連する実験動画

Updated: Jun 29, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

自己振動するポリマーゲルのパターンの形成と形状の変化

Victor V Yashin1, Anna C Balazs

  • 1Chemical Engineering Department, University of Pittsburgh, Pittsburgh, PA 15261, USA.

Science (New York, N.Y.)
|November 4, 2006
PubMed
まとめ
この要約は機械生成です。

私たちは,2D変形と化学反応をシミュレートした,反応性ゲルのためのコンピューティングモデルを作成しました. このモデルは,ゲルの動的膨胀パターンと形状の振動を明らかにし,化学機械的プロセスを理解するために不可欠です.

さらに関連する動画

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 Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

関連する実験動画

Last Updated: Jun 29, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

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 Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

科学分野:

  • ポリマーサイエンスの科学
  • 化学工学は化学工学というものです.
  • コンピューティング・モデリング

背景:

  • 反応性ゲルは,内部化学反応とネットワーク変形による複雑な行動を示します.
  • これらの化学機械的プロセスを理解することは,高度な材料の設計の鍵です.
  • 以前のモデルでは,2D効果やダイナミックなパターンの形成を単純化したことが多かった.

研究 の 目的:

  • 反応性ゲルの大規模な2D変形をシミュレートするための効率的な計算モデルを開発する.
  • 化学反応とゲル形態学の相互作用を調査する.
  • 特定の化学反応を経験するゲルのパターン形成と形状の振動を分析する.

主な方法:

  • 膨らんだポリマーネットワークの2D変形をシミュレートするための新しい計算モデルを開発しました.
  • 化学反応のダイナミクスを組み込み,特にベロウソフ・ザボチンスキー反応.
  • その結果生じる体積変化,形状変容,動的パターン形成を分析した.

主要な成果:

  • このモデルは,反応性ゲルの大規模な2D変形と化学反応を正確に捉えます.
  • 局所的な腫れが移動する波が観測され,多様な動的パターンにつながった.
  • ゲルの寸法が観察されたパターンと振動に決定的な影響を及ぼすことを実証しました.

結論:

  • 開発されたモデルは,反応性ゲルの化学メカニカルプロセスを研究するための効果的な計算ツールです.
  • この発見は,2D効果とゲル次元がダイナミックな行動を決定する上で重要であることを強調しています.
  • 化学活動によって引き起こされる形態学的変容についての洞察を提供します.