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関連する概念動画

Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...

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関連する実験動画

Updated: Jun 21, 2026

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
11:17

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Published on: January 19, 2016

制限回転に基づく溶媒プログラム可能なポリマー

Yagang Zhang1, Judith M Lavin, Ken D Shimizu

  • 1Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.

Journal of the American Chemical Society
|August 7, 2009
PubMed
まとめ
この要約は機械生成です。

溶媒可プログラムポリマー (SPP) は,異なる溶媒で加熱することで認識特性を変えることができます. この"溶媒記憶"効果は安定し,逆転し,新しい材料の機能を可能にします.

さらに関連する動画

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

関連する実験動画

Last Updated: Jun 21, 2026

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
11:17

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Published on: January 19, 2016

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

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
  • 超分子化学 超分子化学

背景:

  • 調節可能な認識特性を持つ材料の開発は,高度なアプリケーションにとって不可欠です.
  • 既存のスマートポリマーには,環境刺激に関する安定した,プログラム可能なメモリが欠けていることが多い.
  • ポリマーの形状と認識に対する溶媒の効果は,材料の振る舞いをプログラムするために十分に活用されていません.

研究 の 目的:

  • 制御可能な認識能力を持つ新しい溶媒可プログラムポリマー (SPP) を開発する.
  • 溶剤誘発性特性調節とメモリストレージのメカニズムを調査する.
  • 溶媒のプログラム性の安定性と可逆性を評価する.

主な方法:

  • カーボキシル酸単体を含有する高度に交結したポリマーゲルの合成.
  • ポリマーを高温で極性 (例えば水) と非極性 (例えばトロウレン) の溶媒で加熱する.
  • カーボキシル酸群の溶媒アクセシビリティの変化の分析.
  • 溶媒の除去とサイクリング後のプログラム状態の安定性と可逆性の評価.

主要な成果:

  • SPPは,熱処理後の溶媒の極性に基づいた調節された認識特性を示した.
  • 極性溶媒での加熱は増加し,非極性溶媒での加熱は減少した.
  • プログラムされた状態 (溶媒メモリ) は,冷却および溶媒から取り除く時に保存されました.
  • 溶媒のプログラム性は可逆性があり,5回の加熱/冷却サイクルで完全性を保ちました.

結論:

  • 溶媒可プログラムポリマー (SPP) は,材料認識特性をプログラムするための新しいメカニズムを提供します.
  • 観察された溶媒記憶効果は,C (アリル) -N (イミド) 結合の周りの制限された回転に起因し,機能群をロックします.
  • SPPは安定し,反転し,繰り返し切り替えが可能で,高度な反応性材料への道を開く.