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関連する概念動画

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...
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
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,...
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,...
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,...

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関連する実験動画

Updated: Jun 4, 2026

Microwave-assisted Functionalization of Poly(ethylene glycol) and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
15:33

Microwave-assisted Functionalization of Poly(ethylene glycol) and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation

Published on: October 29, 2013

サイクルポリマーベースのゲル.

Ke Zhang1, Melissa A Lackey, Jun Cui

  • 1Department of Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003, United States.

Journal of the American Chemical Society
|March 1, 2011
PubMed
まとめ
この要約は機械生成です。

リング膨張メタテシスポリメリゼーション (REMP) とチオール-エネ化学により合成された新型のサイクルポリマーネットワークは,強化された特性を示す. これらのサイクリックポリー ((5-ヒドロキシ-1-サイクロオクテン) (PACOE) ゲルは,線形ポリマーゲルと比較して,より優れた膨らみと機械的強度を示します.

さらに関連する動画

The Synthesis of RGD-functionalized Hydrogels as a Tool for Therapeutic Applications
09:30

The Synthesis of RGD-functionalized Hydrogels as a Tool for Therapeutic Applications

Published on: October 7, 2016

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

関連する実験動画

Last Updated: Jun 4, 2026

Microwave-assisted Functionalization of Poly(ethylene glycol) and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
15:33

Microwave-assisted Functionalization of Poly(ethylene glycol) and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation

Published on: October 29, 2013

The Synthesis of RGD-functionalized Hydrogels as a Tool for Therapeutic Applications
09:30

The Synthesis of RGD-functionalized Hydrogels as a Tool for Therapeutic Applications

Published on: October 7, 2016

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

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
  • 有機化学 オーガニック・ケミストリー

背景:

  • 伝統的なポリマーネットワークは,しばしば線形ポリマー鎖から合成されます.
  • サイクリックポリマーは,線形アナログでは見られないユニークなトポロジカル構造を提供します.
  • サイクルポリマーネットワークの構造-特性関係を理解することは,高度な材料設計において極めて重要です.

研究 の 目的:

  • サイクリックポリ(5-ヒドロキシ-1-サイクロオクテン) (PACOE) から新しいネットワーク材料を合成し,特徴づけること.
  • 線形PACOEと比較して,サイクルPACOEを前駆体として使用することで,ネットワーク特性に与える影響を調査する.
  • これらの新しいサイクルポリマーゲルの特性に対する初期ポリマー濃度の影響を調査する.

主な方法:

  • 環膨張メタテシスポリメリゼーション (REMP) によるサイクルPACOEの合成.
  • チオール-エネ化学を用いたPACOEのクロスリンクは,ネットワークゲルを形成する.
  • ゲル分数 (GF),膨胀率 (Q),およびポリマーの初期濃度 (C(0) の変動でモジュール (G) を含むゲル特性の特徴付け.

主要な成果:

  • 周期的なPACOEゲルは,トポロジカルなクロスリンクを備えたユニークな構造単位を示した.
  • 線形PACOEゲルとは異なり,サイクリックPACOEゲルは同時にGF,Q,Gが増加し,Cが増加した.
  • サイクリックPACOEゲルは,線形PACOEゲルよりも,より高い膨張能力と,断裂時の最大ストレスを示し,差異はより高いC(0) で増幅される.

結論:

  • 新しいネットワーク材料は,チオール-エネ化学を用いて,循環PACOEから効果的に形成することができます.
  • 周期性ポリマー前体の使用は,線形前体と比較して異なるネットワーク特性をもたらします.
  • これらのサイクルポリマーゲルは,膨張と機械的な強度が要求されるアプリケーションに有望な候補を提示します.