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関連する概念動画

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,...
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...
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,...
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,...

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関連する実験動画

Updated: Jul 11, 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

温度に敏感なポリアミドアミンまたはポリプロピレニミンデンドリマーをレンダリングする.

Yasuhiro Haba1, Atsushi Harada, Toru Takagishi

  • 1Department of Applied Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan.

Journal of the American Chemical Society
|October 8, 2004
PubMed
まとめ

研究者らは,イソブチラミド末端のポリ ((アミドアミン)) デンドリマーを合成した. 高世代デンドリマーは,より低い臨界溶液温度を示し,効率的な温度感受性特性を示した.

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:

  • ポリアミドアミンデンドリマーは,多様な用途を持つ枝分かれしたマクロ分子です.
  • 刺激に反応する材料の開発は,高度なアプリケーションにとって極めて重要です.
  • 表面改変によってデンドリマーの性質を制御することは,活発な研究分野です.

研究 の 目的:

  • イソブチラミド (IBAM) 末端のポリアミドアミンのデンドリマーを合成する.
  • IBAMグループ密度のデンドリマー特性,特に温度感受性に対する影響を調査する.
  • 温度反応性ポリマーを作成するためのIBAM機能化の可能性を評価する.

主な方法:

  • イソバター酸と1,3-ジクロヘキシルカルボダイミドを用いてIBAM末端のポリ・アミドアミン・デンドリマー (G2-G5) の合成.
  • 核磁共振 (NMR) スペクトロスコーピー (1Hと13C) を用いて,IBAMグループへの結合を確認した.
  • 温度による溶解性の変化を観察することによって,低臨界溶液温度 (LCST) を決定する.

主要な成果:

  • 世代G2~G5にわたるポリアミドアミンのデンドリマー末端にIBAM群の成功結合.

さらに関連する動画

Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation
11:09

Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation

Published on: August 1, 2018

Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides
09:54

Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides

Published on: August 20, 2018

関連する実験動画

Last Updated: Jul 11, 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

Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation
11:09

Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation

Published on: August 1, 2018

Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides
09:54

Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides

Published on: August 20, 2018

  • IBAM末端のG2 dendrimerは水溶性であり続けました.
  • IBAM末端のG3,G4,G5デンドリマーは,それぞれ75°C,61°C,43°CのLCSTの減少を示した.
  • IBAMグループ密度の漸進的な増加は,より高い世代とともに,LCSTの有意な減少と相関していた.

    • 結論:

    • 末端IBAM群の密度は,ポリアミドアミンのデンドリマーの低臨界溶液温度 (LCST) に直接影響する.
    • 世代数が増加すると,IBAM群の密度が高くなり,温度に敏感な行動が強化されます.
    • IBAMグループによる機能化は,ポリプロピレニミン dendrimers を含む dendrimers に温度感性を与えるための効果的な戦略です.